Zoom lens system

ABSTRACT

A zoom lens system is disclosed. The zoom lens system forms a final image of an object and a first intermediate real image between the object and the final image. The zoom lens system includes a first optical unit located between the object and the first intermediate real image. The first optical unit comprises at least one optical subunit which is moved to change the size (magnification) of the first intermediate real image. The zoom lens system also includes a second optical unit located between the first intermediate real image and the final image, at least a portion of which is moved to change the size (magnification) of the final image. The zoom lens system provides a wide zoom range of focal lengths with continuous zooming between the focal lengths and optional image stabilization.

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims the benefit of U.S. ProvisionalApplication No. 60/397,882, filed Jul. 22, 2002, which application isspecifically incorporated herein, in its entirety, by reference.

BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] This invention relates to optical lens systems for cameras andother optical devices, and, in particular, to high performance zoom lenssystems that produce a high quality image over a full zoom range offocal lengths and are capable of being provided with an extremely largezoom ratio.

[0004] 2. Description of Related Art

[0005] General Background of the Invention. The use of zoom lens systemsfor all types of photography, such as broadcast television, highdefinition television (“HDTV”), advanced television (“ATV”), videocamcorders, film cinematography and still photography has becomeincreasingly popular. As the use of zoom lens systems has increased, thedemand for wider ranges of zooming capability, i.e. large zoom ratios,has also increased. For example, the zoom lens systems used in broadcasttelevision have steadily increased in zoom ratio capability over theyears to a maximum of about 101 to 1 at present but there is a demandfor a still larger zoom ratio. While the focal length range of aconventional zoom lens system may be increased by the use of a drop-inextender or other multiplier, such as a broadcast television zoom lenssystem with a focal length range of 8.9 mm to 900 mm being increased to17.8 mm to 1800 mm to increase the telephoto capability, this does notchange the zoom ratio of about 101 to 1. Moreover, for broadcasttelevision zoom lens systems there are somewhat different requirementsfor “studio” (indoor) or “outside broadcast” (outdoor) use concerningthe focal length range and acceptable “f” numbers, whereby it has becomeconventional practice to employ two different zoom lens systems forindoor and outdoor broadcast television uses to maximize thecapabilities for both types of uses.

[0006] Further, in addition to the demand and desirability of using zoomlens systems with wider ranges of focal lengths, such lenses must retainsuperior optical characteristics and performance that previously hasbeen accomplished only by using separate objective lenses of differentfixed focal lengths or zoom lens systems with a limited zoom ratio. Asthe zoom ratio increases, the difficulty in providing a high performanceoptical system with superior characteristics and performance alsoincreases. Even most previously available zoom lens systems of a limitedzoom range have one or more undesirable limitations such as theinability to focus adequately over the entire focal length range, theinability to focus on close objects, the lack of adequate opticalperformance over the entire focal length range and focus distance, thecost, the large size for the limited zoom range achieved and the like.

[0007] Still further, as the zoom range of a lens system increases,generally the length and weight increases whereby the difficulty inmaintaining the lens and camera steady also increases. Therefore imagestabilization also becomes an issue for the design of a practical zoomlens system having a large focal length range and zoom ratio.

[0008] Moreover, as the focal length range of a zoom lens systemincreases, generally the focusing problems also increase. Although closefocusing at long focal lengths of the zoom range is not absolutelynecessary, it is required at lesser focal lengths. In the past,continuous focusing over a considerable conjugate range from infinity toobjects at a very short distance such as about 8 feet or less has beendifficult to achieve. Further, the problem of “breathing” of the finalimage (where the perceived size changes as the focus distance ischanged) at shorter focal lengths must be minimized to avoid, forexample, one person disappearing from the scene as the focus is changedto another person at a different distance from the lens. These focusperformance requirements, including maintaining the quality of the finalimage, tend to increase substantially the weight and cost of the zoomlens system unless the size can be minimized and performance maximizedby the overall lens design, including glass selection.

[0009] Background Information Concerning Zooming. As discussed above,zoom lens systems with a wide-range of focal lengths are very desirablein numerous photographic applications, including broadcast television,cinematography and video and still photography. One standard zoom lenssystem used in these applications has a four-group PN(P or N)Pstructure, where P stands for a group of at least one lens elementwherein the lens group has positive power, N stands for a group of atleast one lens element wherein the lens group has negative power, andthe groups are identified consecutively from the object space toward theimage space, as is conventional. The front positive group is oftencalled the focusing group because it can be moved for focusing the zoomlens system at any focal length position without the need to refocus forany other focal length of the zoom lens. The second negative group isthe variator, and it induces significant magnification change duringzooming. The third group, which can in general have either positive ornegative power, is the compensator, and it is movable to insure that theimage plane remains stationary. It also can provide some of themagnification change to effect zooming. The final positive fourth groupis often called the prime lens group because it forms a sharp image.

[0010] This basic zoom lens system is suitable for zoom ratios of 50:1or even more. As the zoom ratio is extended to about 100:1, however, thevariator is required to change its object magnification to such anextent during zooming that aberrations become impracticably large anddifficult to correct. In addition, at such large zoom ratios there is avery large change in entrance pupil location during zooming, and thistends to make the front group very large and difficult to correct.Another problem derives from the fact that, to reduce the aberrationchange that results from a large change of magnification, it isdesirable that the variator have reduced optical powers. Weaker opticalpower, however, also increases the lens travel and length of the opticalsystem. For a narrow field-of-view this would not be a problem, but, fora wide field-of-view, large motions lead to an increase in the principalray heights at the rear portion of the lens system. Since therequirements for either the front or the rear of the lens system can besatisfied, but not simultaneously, this results in no ideal place forthe aperture stop. If the stop is placed near the front of the lens, thefront lens element diameters, and resultant aberrations, are reduced,and if the aperture stop is placed nearer to the rear part of the lenssystem, the rear lens diameters and resultant aberrations are decreased.

SUMMARY OF THE INVENTION

[0011] General Summary of the Invention. It is an object of the presentinvention to provide a zoom lens system that overcomes the problems andinefficiencies of prior zoom lens systems having large zoom ratios. Afurther object is to provide a zoom lens system with a wide zoom rangeof focal lengths and high performance characteristics for both indoorand outdoor use. A still further object of this invention is to providea zoom lens system with a ratio of about 300 to 1 and a zoom range, forexample, from about 7 mm to 2100 mm focal length, with continuouszooming between the focal lengths. Still another object of thisinvention is to provide a high performance zoom lens system with anoptical system having a front zoom lens group for forming anintermediate image and a rear zoom lens group to magnify that image tothereby produce an extremely large zoom ratio. Still another object isto provide such a zoom lens system with optical image stabilization.Still another object is to provide such a zoom lens system with afocusing lens group capable of precise focusing over the entire focallength range of the zoom ratio.

[0012] Although of particular benefit for achieving large zoom ratios,the zoom lens systems of the invention can have conventional zoomratios, e.g., zoom ratios associated with such consumer products asvideo camcorders, still cameras and the like. It is an additional objectof the invention to produce zoom lens systems for these smaller zoomratio applications.

[0013] Other and more detailed objects and advantages of the presentinvention will readily appear to those skilled in the art from thevarious preferred embodiments.

[0014] Summary of the Zoom Ratio Aspects of the Invention. The presentinvention overcomes the obstacles that currently limit zoom lens systemsto a zoom ratio of about 101:1. The basic idea of the invention can beviewed as the use of a compound zoom lens system that consists of twoseparate zoom lens portions wherein the front zoom lens portion forms anintermediate image, and the rear zoom lens portion is a relay thattransfers the intermediate image formed by the front zoom lens portionto the final image. The total zoom ratio of the complete compound zoomlens system is equal to the zoom ratio of the front zoom lens multipliedby the zoom ratio of the relay. Thus, if the zoom ratio of the frontzoom lens portion is 20:1 and the zoom ratio of the relay is 15:1, thenthe zoom ratio of the entire compound zoom lens system is 300:1. Thepresent invention can be used to achieve a zoom ratio of 300:1 or more,which greatly exceeds the practical limit of conventional zoom lenssystems.

BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIGS. 1-5 are optical diagrams of compound zoom lens systems ofthe present invention for describing some of the principles andvariations in the moving and fixed units employed in the system and someof the possible embodiments of the invention, with FIGS. 1-3illustrating a system having about a 300:1 zoom ratio, FIGS. 4A and 4Bhaving about a 130:1 zoom ratio and FIGS. 5A and 5B having about a 13:1zoom ratio in an ultra wide angle lens system;

[0016]FIGS. 6A and 6B are optical diagrams of another embodiment of thezoom lens system of the present invention using three moving zoom lensgroups, with the three zoom groups positioned for a short focal lengthin FIG. 6A and for a long focal length in FIG. 6B;

[0017]FIGS. 7A and 7B are optical diagrams of another embodiment of thezoom lens system of the present invention using four moving zoom lensgroups, with the four zoom groups positioned for a short focal length inFIG. 7A and for a long focal length in FIG. 7B;

[0018]FIGS. 8A and 8B are optical diagrams of another embodiment of thezoom lens system of the present invention using four moving zoom lensgroups, with the four zoom groups positioned for a short focal length inFIG. 8A and for a long focal length in FIG. 8B;

[0019]FIGS. 9A and 9B are optical diagrams of another embodiment of thezoom lens system of the present invention using three moving zoom lensgroups, with the three zoom groups positioned for a short focal lengthin FIG. 9A and for a long focal length in FIG. 9B;

[0020] FIGS. 10-62 are figures that all relate to a single embodiment ofthe zoom lens system of the present invention that has a zoom ratio ofabout 300: 1, with FIG. 10 being an optical diagram of the entire lenssystem, FIGS. 11-30 comprising optical diagrams of the lens system in 20different representative positions of the movable lens elements, FIGS.31-34 comprising optical diagrams of only the lens elements of the focusunit in four of the representative positions, FIGS. 35 and 36illustrating only the front two zoom lens groups in two of therepresentative positions, FIGS. 37 and 38 illustrating only the rearzoom lens group in two of the representative positions, FIGS. 39-58comprising ray aberration diagrams for the same 20 representativepositions of all of the lens elements illustrated in FIGS. 11-30,respectively, FIG. 59 comprising a graph of the focus cam movementrelative to the focus distances from minimum (bottom) to infinity (top),FIG. 60 comprising graphs of the three zoom cam movements relative tothe system focal lengths, FIG. 61 comprising a graph of the “f” numbersof the system at the final image relative to the system focal lengths,and FIG. 62 comprising a graph of the stop diameters relative to thesystem focal lengths;

[0021]FIGS. 63 and 64 are an optical diagram and ray aberration graphs,respectively, for another embodiment of the zoom lens system of thisinvention incorporating a binary (diffractive) surface;

[0022]FIGS. 65 and 66 are an optical diagram and ray aberration graphs,respectively, for still another embodiment of the zoom lens system ofthis invention incorporating a binary (diffractive) surface; and FIGS.67-70 are figures that relate to a still further embodiment of theinvention having a zoom ratio of about 400:1 with FIGS. 67 and 68 beingoptical diagrams at focal lengths of 7.47 mm and 2983 mm, respectively,and FIGS. 69 and 70 being ray aberration graphs at focal lengths of 7.47mm and 2983 mm, respectively;

[0023]FIGS. 71 and 72A-72D are optical diagrams for an example of stillanother embodiment of the zoom lens system of this inventionincorporating a mirror for folding the lens for added compactness, withFIGS. 72A-72D showing the folded lens in a flat (unfolded) orientationfor clarity, and illustrating various positions of the zoom groups;

[0024] FIGS. 73A-73C are optical diagrams for an example of an infrared(IR) embodiment of the zoom lens system of this invention, illustratingvarious positions of the zoom groups; and FIGS. 74-76 are ray aberrationgraphs corresponding to the position of the zoom groups shown in FIGS.73A-73C, respectively.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0025] In the following description of preferred embodiments, referenceis made to the accompanying drawings, which form a part hereof, and inwhich is shown by way of illustration specific embodiments in which theinvention may be practiced. It is to be understood that otherembodiments may be utilized and structural changes may be made withoutdeparting from the scope of the preferred embodiments of the presentinvention.

[0026] In accordance with its general aspects, the invention provides azoom lens system for forming a final image of an object, said systemforming a first intermediate real image between the object and the finalimage, said system comprising:

[0027] (a) a first optical unit (e.g., lens elements 8 through 15 inFIG. 10) located between the object and the first intermediate realimage, said unit comprising at least one optical subunit which is movedto change the size (magnification) of the first intermediate real image(e.g., lens elements 8 through 11 are the primary source ofmagnification change for the first optical unit in FIG. 10); and

[0028] (b) a second optical unit (e.g., lens elements 26 through 33 inFIG. 10) located between the first intermediate real image and the finalimage at least a portion of which (e.g., one or more optical subunits orthe entire second optical unit) is moved to change the size(magnification) of the final image (e.g., in FIG. 10, lens elements 26through 28 of the second optical unit are moved to change the size ofthe final image).

[0029] Preferably, the zoom lens system includes one or more opticalsubunits in either or both of the first and second optical units whichis moved to hold the axial position of the final image substantiallystationary as the focal length of the system is changed (e.g., lenselements 12 through 15 are the primary source of this function in FIG.10). Such a subunit, however, may not be needed in all cases, e.g., ifthe overall optical system has an axially movable sensor.

[0030] Preferably, in addition to the first and second optical units,the zoom lens system comprises a focus unit (e.g., lens elements 1through 7 in FIG. 10), a pupil imaging unit(e.g., lens elements 16through 25 in FIG. 10), and/or an image stabilization unit (e.g., lenselements 34 through 39 in FIG. 10).

[0031] Preferably, the focus unit is (1) positioned in front of thefirst optical unit, (2) comprises two optical subunits that are movablealong the zoom lens system's optical axis (e.g., lens element 2 andelements 3 and 4 in FIG. 10), and/or (3) comprises seven or less lenselements.

[0032] Preferably, the image stabilization unit comprises (1) at leastone lens element that is laterally movable off the system's optical axis(e.g., lens elements 34 through 36 in FIG. 10), and/or (2) at least onelens element that is movable along the optical axis (e.g., lens elements37 through 39 in FIG. 10). The light passing through the system ispreferably substantially collimated between said laterally and axiallymovable lens elements of the image stabilization unit.

[0033] In addition to the first intermediate real image, the zoom lenssystems of the invention can form additional intermediate real imagesbetween the object and the final image. The systems can includeadditional optical units besides the first and second units for changingthe sizes (magnifications) of those additional intermediate real images.

[0034] Preferably, the first intermediate real image is formed in an airspace between the optical elements of the zoom lens system (e.g., thelens elements, prisms, folding mirrors or the like used in the system)and does not pass through any surface of an optical element duringzooming. When more than one intermediate real image is formed, this isalso preferably true for all of the intermediate images.

[0035] The first optical unit in combination with other units of thesystem can have the form of a conventional zoom lens. Similarly, thesecond optical unit in combination with other units of the system canhave a conventional zoom lens form. The overall system can thus beviewed as a “compounding” of two conventional zoom lenses with, inaccordance with the invention, control of pupil imaging between thecompounded zoom lenses.

[0036] The overall system can also be viewed as a front zoom lens whichforms an intermediate image and a relay system which receives theintermediate image and changes its magnification to form the finalimage.

[0037] These approaches for describing the zoom lens systems of theinvention are used herein in the detailed discussions of various aspectsof the invention. Although these approaches provide a convenient way ofdescribing the invention, it is to be understood that the invention isnot limited to these descriptions and various embodiments andapplications of the invention may not be completely amenable to suchdescriptions.

[0038] In accordance with other aspects, the invention provides a zoomlens system for forming a final image of an object, said system having arange of focal lengths between a maximum focal length and a minimumfocal length and forming at least a first intermediate real imagebetween the object and the final image for all focal lengths within saidrange, said system comprising:

[0039] (a) a first lens unit having a focal length that is changed tochange the size (magnification) of the first intermediate real image,said first lens unit being located between the object and the firstintermediate real image for all focal lengths within said range; and

[0040] (b) a second lens unit for changing the size (magnification) ofthe final image, said second lens unit being located between the firstintermediate real image and the final image for all focal lengths withinsaid range.

[0041] In accordance with additional aspects, the invention provides azoom lens system which comprises a variable focal length front lens unitwhich forms an intermediate real image and a variable magnification rearlens unit which forms an image (preferably, a real image) of theintermediate image.

[0042] In accordance with further aspects, the invention provides acompound zoom lens system that collects radiation from an object spaceand delivers the radiation to a final image in image space, said systemcomprising multiple zoom lens portions including a first zoom lensportion forming an intermediate image of the radiation from the objectspace and a last zoom lens portion forming the final image in the imagespace.

[0043] In accordance with still further aspects, the invention providesa zoom lens system for forming a final image of an object, said systemhaving an optical axis, a front lens surface, an aperture stop, and achief ray which crosses the optical axis at the aperture stop, saidsystem comprising first and second lens units that are moved to changethe focal length of the system, wherein:

[0044] (a) between the front lens surface and the final image, the chiefray crosses the optical axis at at least one other location besides saidaperture stop for all focal lengths of the system; and

[0045] (b) the system forms an intermediate real image that is locatedbetween the first and second lens units for all focal lengths of thesystem.

[0046] Description of Some Zooming Principles and Systems of theInvention. There are some unique aspects to a compound zoom lens system(i.e., a front zoom/zoom relay system) that enables an extraordinarilyhigh degree of optical correction to be achieved. Imagine for a moment asimplified scenario in which the complete zooming motion takes place instages. In the first stage the relay is initially set at a short focallength position that provides a small magnification of the intermediateimage. The object conjugate of the relay will then have a smallnumerical aperture NA and its image conjugate will have a largenumerical aperture NA. (As conventionally defined, the numericalaperture “NA” is equal to the sine of the vertex angle of the largestcone of meridional rays that can enter or leave an optical system orelement, multiplied by the refractive index of the medium in which thevertex of the cone is located; and in the lens system opticalprescriptions set forth below the “f” number equals the inverse of twiceNA, i.e. f=1/2×NA). Since the NA in object space for the relay is equalto the NA in image space for the front zoom lens portion, then it isclear that in this first stage, the front zoom lens portion need only bewell corrected for a small NA.

[0047] In the second stage, the front zoom lens portion is stationary atits long focal length position, and the relay then zooms to magnify theintermediate image to a greater and greater extent. As the focal lengthof the system increases during this second stage, the image NA of therelay becomes smaller and the object NA of the relay becomes larger.Hence, the image NA of the front zoom lens portion must also becomelarger. However, at the same time, the radial part of the intermediateimage that is actually used becomes smaller and smaller as the systemfocal length gets larger.

[0048] Thus, the front zoom lens portion need not be corrected for asimultaneously large intermediate image size and a large relativeaperture (NA). Rather, it needs to be corrected for a large intermediateimage size at a small aperture, and for a small intermediate image sizeat a large aperture. This makes the design of the front zoom lensportion considerably easier than the design of a traditional zoom lenssystem having the same zoom ratio as the front zoom lens system of thepresent invention.

[0049] Likewise, the relay need only be corrected for a large image NAand large object size at the small magnification end of its focallengths. At the other end of its zoom range of focal lengths, the objectsize is small and the image NA is also small.

[0050] As discussed above, in addition to a front zoom lens portion anda relay, the zoom lens systems of the invention preferably also includea pupil imaging unit. This unit serves to image the exit pupil of thefront zoom lens portion into the entrance pupil of the relay. Byselecting the appropriate powers, not only can the lens diameters, andattendant aberrations, of the relay be minimized, but control of theexit pupil position of the system can be improved.

[0051] As also discussed above, the intermediate image formed by thefront zoom lens portion is preferably located at a position where itdoes not pass through any lens surfaces as the system is zoomed from itsminimum to its maximum focal lengths. By being between the front zoomlens portion and the rear relay, the intermediate image is automaticallybehind the axially moving lens unit or units that provide zooming in thefront zoom lens portion and in front of any axially moving lens unitsthat provide zooming in the rear zoom portion. Since in certainembodiments of the invention the intermediate image can move duringzooming, the locations for the lens surfaces on either side of theintermediate image, whether those surfaces are fixed or moving, arepreferably chosen so that notwithstanding the motion of the intermediateimage, the surfaces remain spaced from the intermediate image throughoutthe zoom range of the system.

[0052] Various of the foregoing features of the invention areillustrated in FIGS. 1-3 for a PNPP-PNPP compound zoom lens system witha zoom ratio of about 300:1. As indicated in FIG. 1, this compound zoomlens system has a front zoom lens portion with a zoom ratio of about20:1 and a rear zoom lens portion (relay) with a zoom ratio of about15:1. The groups and their positive or negative power signs are alsoindicated in FIG. 1. In this compound zoom lens system, the relay isstationary as the front zoom lens portion is operated from its shortestfocal length position (shown in FIG. 1) to its longest focal lengthposition (shown in FIG. 2). Once the front zoom lens portion reaches itslong focal length position, the relay begins to vary the magnificationof the intermediate image to further increase the focal length of thecompound system. FIG. 3 shows the system in its maximum focal lengthcondition, in which the front zoom lens portion is at its maximum focallength position and the rear zoom (relay) lens portion is in its maximummagnification position.

[0053]FIGS. 1 and 2 show the small NA at the intermediate image planeand large NA at the final image plane that occurs during the initialphase of zooming from short to long. The size of the intermediate imageis large during this phase, as shown in the figures. FIG. 3 shows thatthe NA becomes larger at the intermediate image and smaller at the finalimage at the longest focal length position.

[0054] Note that in this example there are 8 zoom lens groups, but only4 of them are independently movable for zooming. The 1st, 4th, 5th, and8th groups are all stationary with respect to the final image. Duringfocusing, however, one or more of these groups can be made to move.

[0055] The scenario sketched out here is for exemplary purposes. Inpractice, the zooming motion need not be clearly divided into twostages, and as a result the relay or a part of it can move during theinitial zooming stages and not just near the long end of the focallengths.

[0056] The example of FIGS. 1-3 described above has a PNPP-PNPPconstruction in which the dash “-” signifies the end of the front zoomlens portion. Both the front zoom lens portion and rear zoom lensportion have variator and compensator zooming groups. One advantage ofthis configuration is that the intermediate image can be made absolutelystationary if desired. Rendering the image stationary will prevent itfrom passing through any optical surface that might reveal surface flawsand dust images that will appear at the final image. Using a four-groupconstruction in the rear zoom lens portion also permits better controlof the exit pupil position, which may be important for matching thetelecentricity requirements of certain image sensors.

[0057] If movement of the intermediate image can be tolerated, then itis possible to eliminate one of the compensators. Removal of the rearcompensator is preferred in this case because it only moves when thebeam diameters are relatively small. The resulting construction willthen be a PNPP-PNP configuration.

[0058] For both of these configurations care must be taken to match theexit pupil of the front zoom lens portion with the entrance pupil of therelay. For this purpose, an eyepiece-like group is beneficial forconverting the diverging beams emanating from the intermediate imageinto approximately parallel beams entering a normal PNP- or PNPP-typezoom lens system corrected for infinite conjugates.

[0059] One aspect of high-speed (large aperture) ultra-wide-range offocal lengths compound zoom lens systems of this type is that theintermediate image and all of its image faults are highly magnified bythe zoom groups in the relay at the long focal length position. Thisplaces stringent requirements on the correction of secondary coloraberrations in the front zoom lens portion and especially the focusinggroup. In order to accomplish this correction, it is necessary to use atleast one, and more likely several, fluor-crown glass elements. As analternative, calcium fluoride or binary (diffractive) surfaces couldalso be used for this purpose.

[0060] A variety of binary (diffractive) surfaces (diffractive elements)can be used in the practice of the invention. For example, for certainapplications, one or more diffractive optical elements of the typedisclosed in U.S. Pat. No. 6,507,437, assigned to Canon, can be used,either alone or in combination with other approaches for correctingchromatic aberrations.

[0061] One big advantage of using a PNPP-PNPP or PNPP-PNP configurationover existing zoom lens systems is that both the front zoom lens portionand the rear zoom lens portion (relay) system can have very large zoomratios. It is quite reasonable to have a zoom ratio of 20:1 or more foreither the front zoom lens portion or the rear zoom lens portion in thiscase, so that a total zoom ratio of 400:1 or more is possible. However,if such a large zoom ratio is not required, it is possible to simplifythe system significantly by instead using a relay with an NPconfiguration having two moving groups. Such a relay is very useful forlarge aperture applications with a total zoom ratio in the relay ofabout 3:1 to about 10:1. An example of a compound zoom lens system witha zoom ratio of about 130:1 having an about 20:1 zoom ratio PNPP frontzoom lens portion and an about 6.5:1 zoom ratio relay is shown in FIGS.4A and 4B. FIG. 4A illustrates the minimum focal length of about 7 mmand FIG. 4B illustrates the maximum focal length of about 900 mm. Onedisadvantage of this configuration is that the rearmost lens group isnot stationary; hence it must be designed to withstand a considerablechange of magnification at large apertures, which makes it somewhatdifficult to design.

[0062] An even further simplified construction consisting of an NP frontzoom lens portion and an NP rear zoom lens portion (relay) can also bedesigned, although the maximum zoom ratio in this case will be lowered.Clearly, the technique can be generalized to include a large number ofcombinations of various zoom lens arrangements for the front zoom lensportion and for the rear zoom lens portion. For example, a high zoomratio, ultra wide angle zoom lens system can be constructed by using anNP, NPP or NPNP ultra wide angle front zoom lens portion having a zoomratio of about 2:1 with an NP rear zoom lens portion (relay) having azoom ratio of about 6.5:1. The result would be a compound zoom lenssystem with a zoom ratio of about 13:1 with a maximum full field of viewof up to 100 degrees or more. FIGS. 5A and 5B illustrate a 4.4 mm-57.2mm, f/3-f/7 compound zoom lens system with a zoom ratio of about 13:1for a ⅔″ sensor. The full-field angle at the wide-angle end of thiscompound zoom lens system is more than 102 degrees. Clearly, a PNPP-typerear zoom lens portion (relay) similar to the one used in FIGS. 1-3could be used with this same ultra wide angle front zoom lens portion toyield an ultra wide angle compound zoom lens system with a zoom ratio ofabout 30:1.

[0063] The existence of an intermediate image is common to all of theseconfigurations, and this offers some unique opportunities for aberrationcorrection that are not typically available in zoom lens system types ofthe prior art. For example, aspheric surfaces placed on elements locatednear the intermediate image can have a strong impact on distortion andother field aberrations without disturbing the spherical aberrationcorrection. Advantages of placing an aspheric surface in this areainclude that the tolerances are generous because the beam diameters aresmall, and the elements themselves are small. This means that the costof using aspheric surfaces in this region is minimal.

[0064] Detailed Description of the Preferred Embodiments. As describedabove in the section entitled “Description of Some Zooming Principlesand Systems of the Invention”, each of the herein disclosed embodimentsof the present invention includes a front zoom lens portion and a rearzoom lens portion thereby forming a compound zoom lens system. Anintermediate image is formed after the front zoom lens portion wherebythe rear zoom lens portion functions as a zoom relay to magnify theintermediate image so as to produce the magnified final image forcapturing by film or any other kind of light detector or capture device,such as a charge coupled device (CCD), in a camera. For purposes of thisapplication, the term “camera” is used generically to describe any kindof light detecting or capturing device that may be placed after the lenssystem of the present invention, including a still, video or moviecapture device, whether containing film, videotape, optical disk, CMOS,CCD or another storage medium, or an eyepiece or the human eye. Any such“camera” may include additional lens elements. At present it iscontemplated that the front zoom lens portion will be comprised of twomoving zoom lens groups and the rear zoom lens portion will be comprisedof either one or two moving zoom lens groups, but it is to be understoodthat more or fewer moving zoom lens groups may be used without departingfrom the present invention. Also, at present it is contemplated thatonly one intermediate image will be formed in the entire compound zoomlens system but other embodiments of the present invention may form morethan one intermediate image.

[0065] In addition to the front and rear zoom lens portions, thecompound zoom lens system of the present invention preferably includes afocus lens group. It is preferred that the focus lens group bepositioned at the front of the lens system, as shown by each of theembodiments disclosed herein, although it is possible to accomplish someand maybe all of the focusing elsewhere in the compound zoom lens systemin other embodiments of the invention.

[0066] When a single intermediate image is formed in this compound zoomlens system, the final image is upside down and reversed left-to-rightfrom the conventional orientation produced by an objective lens andtherefore the image orientation must be accommodated by the camera. Fora video camera using a single chip for the detector, it is possible tomerely rotate the chip 180 degrees about the optical axis so that thechip reads the final image as though it is conventionally oriented.Another solution to the orientation problem for a video camera is toreverse the order in which the data is scanned, i.e. instead of fromleft-to-right and top-to-bottom the data can be read right-to-left andbottom-to-top to achieve the conventional orientation. Still anothersolution to the orientation problem for a video camera that uses a“frame store” feature to store an entire frame on a memory chip beforeit is transmitted for use is to merely transmit the stored frame fromthe frame store memory in the reverse order. For a movie film camera,the entire camera with the film magazine may be turned upside down to,as a result, run the film upwardly for correcting the image orientation.Another solution for the orientation of the image in a movie film cameraused in the conventional manner and employing the present zoom lenssystem is to use digital compositing wherein the film is digitallyscanned and then, for example, after digital manipulation the image isimposed on new film in the conventional orientation. The use of a prismin or in connection with the lens system of this invention will alsocorrect the orientation of the final image. For this approach, care mustbe taken so that the prism will not cause excessive deterioration of thequality of the final image, especially for high performance applicationsof the present lens system.

[0067] Due to the compound zoom arrangement of the zoom lens system ofthe present invention, the body of the compound lens system will oftenbe of substantial length and therefore any deflection or vibration ofthe lens system relative to the camera may cause unacceptable deflectionor vibration of the final image in the camera. Thus, at least forcompound zoom lens systems of the present invention having large zoomratios, long focal lengths and/or substantial length, it is contemplatedthat an image stabilization arrangement will be employed. Whileelectronic image stabilization may be appropriate for some video cameraapplications, for higher performance zoom lens system applications it ispreferred that an optical image stabilization arrangement be included inthe body of the compound zoom lens system and preferably near the cameraend of the lens system, such as is included in the embodiment of FIGS.10-62 described below.

[0068] Although it is more desirable to design and construct thecompound zoom lens system of this invention as an integral unit formaximum performance, it is also possible to use two or more separablecomponents to achieve the basic features. For example, a conventionalzoom lens or a modified form thereof may be used as the front zoom lensportion and then the rear zoom lens portion may be comprised of aseparate attachment that relays and varies the magnification of (e.g.zooms) the image formed by the front zoom lens portion, which imagebecomes the “intermediate” image, to form the final image. Thus, thefront zoom lens portion will provide one zoom ratio and the rearattachment zoom portion will provide another zoom ratio. However, forsuch a combination, the pupil imaging should be controlled to obtain afinal image of acceptable optical quality. Other such combinations ofconventional and/or modified lens portions may also be used to providethe compound zoom lens system of the present invention.

[0069]FIGS. 6A through 9B illustrate optical diagrams for four differentembodiments of the zoom lens system of the present invention. At the farright of each of the FIGS. 6A-9B the two rectangular blocks representthe prism blocks for a conventional 3 CCD ⅔″ detector, which is part ofthe video camera and therefore not part of the zoom lens system.

[0070] The following tables list the lens system optical prescriptions,the variable thickness positions for various surfaces, and the focallengths and magnifications for various surface groups for each of thosefour embodiments. For simplicity and clarity in view of the large numberof surfaces and the small scale of the optical diagrams that include allof the elements, only some of the surfaces in FIGS. 6A through 9B thatcorrespond to the surfaces set forth in the lens system opticalprescriptions are identified. A more detailed explanation of the tablesis provided following the tables. TABLES FOR FIGS. 6A & 6B LENS SYSTEMOPTICAL PRESCRIPTION Glass Glass Surface Radius Thickness IndexDispersion OBJECT Infinity Infinity S1 925.010 10.000 1.90135 31.5 S2280.601 20.595 S3 626.503 19.748 1.49699 81.6 S4 −2050.828 0.300 S5−2871.294 12.027 1.49699 81.6 S6 −624.468 0.300 S7 266.779 14.0791.49699 81.6 S8 497.283 0.300 S9 351.230 16.228 1.49699 81.6 S101246.212 0.300 S11* 185.443 25.083 1.49699 81.6 S12 839.856 Variable S13301.162 5.346 1.77249 49.6 S14* 71.693 15.360 S15 −3690.461 2.0001.77249 49.6 S16 100.162 27.480 S17 −70.544 5.456 1.80400 46.6 S18−3458.086 8.858 1.92286 18.9 S19 −125.683 Variable S20 −257.845 12.0631.49699 81.6 S21 −78.411 0.127 S22 149.706 13.001 1.49699 81.6 S23−98.095 2.000 1.80349 30.4 S24 −266.962 0.100 S25 114.669 6.712 1.4969981.6 S26 485.498 Variable STOP Infinity 24.165 S28* −41.960 2.0001.60311 60.7 S29 40.078 31.156 1.69894 30.1 S30 83.406 12.225 S31−64.844 2.590 1.60311 60.7 S32 912.611 13.001 1.69894 30.1 S33 −52.22424.076 S34 99.845 2.313 1.49699 81.6 S35 167.386 15.000 S36 155.60814.122 1.49699 81.6 S37 −47.886 9.568 1.87399 35.3 S38 −67.571 0.018 S39381.504 2.000 1.87399 35.3 S40 49.653 11.590 1.43875 95.0 S41 −583.11243.970 S42* 50.132 14.235 1.43875 95.0 S43 482.784 Variable S44 −23.1472.000 1.69100 54.8 S45* 32.021 1.889 S46 52.655 21.412 1.84666 23.8 S47−380.467 Variable S48 102.416 11.302 1.49699 81.6 S49 −50.958 0.405 S50*34.098 13.134 1.49699 81.6 S51 43.222 1.521 S52 58.738 10.784 1.4969981.6 S53 −35.052 2.000 1.74319 49.3 S54 43.422 1.334 S55 57.389 10.0791.49699 81.6 S56 −38.685 0.658 S57 −35.272 3.772 1.78472 25.7 S58−56.940 0.500 S59 166.529 4.833 1.69100 54.8 S60 −100.192 0.250 S6183.273 5.608 1.69100 54.8 S62 808.144 Variable S63 Infinity 13.2001.51680 64.1 S64 Infinity 2.000 S65 Infinity 33.000 1.60859 46.4 S66Infinity 5.000 IMAGE Infinity

[0071]$Z = {\frac{({CURV})Y^{2}}{1 + \left( {1 - {\left( {1 + K} \right)({CURV})^{2}Y^{2}}} \right)^{1/2}} + {(A)Y^{4}} + {(B)Y^{6}} + {(C)Y^{8}} + {(D)Y^{10}}}$

[0072] where:

[0073] CURV=1/(Radius of Surface)

[0074] Y=Aperture height, measured perpendicular to optical axis

[0075] K, A, B, C, D=Coefficients

[0076] Z=Position of surface profile for a given Y value, as measuredalong the optical axis from the pole (i.e. axial vertex) of the surface.The coefficients for the surface S11 are: K = −0.2197954 A =  9.0593667e−009 B =   1.7844857e−013 C =   1.5060271e−017 D =−9.7397917e−023 The coefficients for the surface S14 are: K =  0.7048333 A = −3.0463508e−007 B = −1.1451797e−010 C =   3.4844023e−014D = −2.2107339e−017 The coefficients for the surface S28 are: K =−0.9252575 A = −1.8743376e−007 B = −1.0562170e−009 C =   2.8892387e−012D = −3.6671423e−015 The coefficients for the surface S42 are: K =−0.0460624 A = −2.6257869e−007 B = −2.5945471e−010 C =   2.4316558e−013D = −1.2995378e−016 The coefficients for the surface S45 are: K =   0.0A = −1.1056187e−005 B =   2.8606310e−008 C = −1.2655154e−010 D =  2.2826095e−013 The coefficients for the surface S50 are: K =   0.0 A =−1.8976230e−006 B =   1.2489903e−009 C = −2.3703340e−012 D =  3.0161146e−015

[0077] VARIABLE THICKNESS POSITIONS AND DATA P1 P2 P3 P4 P5 P6 P7 P8 EFL7.257 9.008 16.013 36.022 82.023 174.970 399.652 900.099 F/No. 1.4501.450 1.450 1.450 1.450 2.000 4.000 5.000 S12 1.000 23.202 72.004118.539 150.121 162.578 162.380 162.474 S19 243.711 218.457 160.76496.265 43.111 0.500 57.093 0.500 S26 1.000 4.080 12.979 30.924 52.63182.760 26.357 82.523 S43 142.978 142.908 142.764 142.760 142.409 140.11089.130 81.860 S47 8.255 8.273 8.377 8.434 8.540 4.765 3.198 5.165 S6219.000 19.000 19.000 19.000 19.000 25.160 77.703 83.508

[0078] Surface Groups Focal Lengths  S1-S12 266.611 S13-S19 −46.300S20-S26 91.566 S27-S43 55.841 S44-S47 −32.720 S48-S62 42.594

[0079] Surface Group Magnifications Surfaces P1 M′ P1 MP′ P2 M′ P2 MP′P3 M′ P3 MP′ P4 M′ P4 MP′  S1-S12 0.000 0.754 0.000 0.672 0.000 0.4920.000 0.320 S13-S19 −0.238 7.670 −0.268 7.215 −0.374 6.275 −0.599 5.828S20-S26 −0.350 0.876 −0.385 0.843 −0.495 0.746 −0.699 0.550 S27-S430.871 −1.159 0.870 −1.159 0.854 −1.159 0.844 −1.159 S44-S47 0.321 −2.8460.322 −2.829 0.325 −2.794 0.327 −2.793 S48-S62 −1.170 −0.304 −1.170−0.305 −1.170 −0.308 −1.170 −0.308 Surfaces P1 M′ P5 MP′ P6 M′ P6 MP′ P7M′ P7 MP′ P8 M′ P8 MP′  S1-S12 0.000 0.195 0.000 0.123 0.000 0.163 0.0000.124 S13-S19 −1.012 7.410 −1.390 −119.200 −1.382 4.682 −1.386 −141.400S20-S26 −0.945 0.312 −1.275 −0.017 −0.715 0.599 −1.279 −0.014 S27-S430.834 −1.159 0.833 −1.159 0.774 −1.159 0.826 −1.159 S44-S47 0.330 −2.7120.338 −2.278 0.769 −0.501 0.856 −0.451 S48-S62 −1.170 −0.313 −1.315−0.361 −2.549 −0.731 −2.693 −0.727

[0080] Where, P1 M′ is lens group magnification of lens group whichequals (entrance marginal ray angle)/(exit marginal ray angle) and, P1MP′ is lens group magnification which equals entrance principal rayangle/exit principal ray angle and so on, upto P8 M′ and P8 MP′; thefirst two characters representing position number, for example P1 M′ andP1 MP′ are for position 1. TABLES FOR FIGS. 7A & 7B LENS SYSTEM OPTICALPRESCRIPTION Glass Glass Surface Radius Thickness Index DispersionOBJECT Infinity Infinity S1 1273.174 10.255 1.80099 35.0 S2 475.2651.538 S3 510.054 10.255 1.80099 35.0 S4 279.310 14.066 S5 459.720 19.3311.49699 81.6 S6 21434.630 0.308 S7 800.941 10.451 1.49699 81.6 S827454.520 0.308 S9 309.779 13.334 1.49699 81.6 S10 634.103 0.308 S11361.606 17.818 1.49699 81.6 S12 2023.306 0.308 S13* 172.930 25.3531.49699 81.6 S14 568.502 Variable S15 330.425 2.070 1.77249 49.6 S16*73.838 18.829 S17 726.741 2.051 1.77249 49.6 S18 102.189 25.577 S19*−73.683 6.352 1.77249 49.6 S20* 359.798 9.948 1.80809 22.8 S21 −116.821Variable S22 −176.211 5.797 1.49699 81.6 S23 −69.609 0.003 S24 144.41520.317 1.49699 81.6 S25 −85.878 2.051 1.80349 30.4 S26 −282.651 0.000S27 85.718 6.142 1.49699 81.6 S28 157.754 Variable STOP Infinity 22.498S30* −34.201 2.051 1.60729 59.4 S31 42.409 2.743 1.69894 30.1 S32101.162 4.085 S33 −82.300 3.589 1.60311 60.7 S34 −90.892 3.444 1.6989430.1 S35 −39.457 6.472 S36 51.200 7.178 1.49699 81.6 S37 55.671 15.382S38 67.546 6.750 1.49699 81.6 S39 −47.804 3.076 1.87399 35.3 S40 −74.6200.018 S41 95.357 3.076 1.87399 35.3 S42 35.060 30.000 1.43875 95.0 S43−130.232 68.459 S44 Infinity 2.051 S45 Infinity 2.051 1.77249 49.6 S46−341.189 8.763 S47* −30.765 4.102 1.78469 26.3 S48 −36.525 21.1091.51680 64.2 S49 −30.389 0.308 S50 −160.796 14.522 1.51680 64.2 S51−66.413 0.308 S52 461.095 8.390 1.51680 64.2 S53 −109.832 7.208 S54*247.113 3.076 1.84666 23.8 S55 57.348 10.868 1.49699 81.6 S56 −56.3600.289 S57 −73.106 5.307 1.63853 55.4 S58 −44.690 Variable S59 −28.7363.076 1.83400 37.2 S60 115.838 2.771 S61 −31.347 2.871 1.83480 42.7 S62−73.220 2.468 S63 −57.858 7.254 1.84665 23.9 S64 −24.994 0.005 S65−29.067 2.871 1.80400 46.6 S66 −49.737 Variable S67 507.291 2.0511.74319 49.3 S68 104.703 7.178 1.49699 81.6 S69 −76.662 Variable S70*69.871 8.624 1.49699 81.6 S71 −663.734 8.908 S72 −155.686 3.076 1.8466523.9 S73 −1137.705 0.202 S74 54.109 8.050 1.49699 81.6 S75 −73.493 0.393S76 −66.184 2.871 1.74319 49.3 S77 −99.535 19.484 S78 Infinity 13.5371.51633 64.1 S79 Infinity 2.051 S80 Infinity 33.841 1.60859 46.4 S81Infinity 5.019 IMAGE Infinity

[0081]$Z = {\frac{({CURV})Y^{2}}{1 + \left( {1 - {\left( {1 + K} \right)({CURV})^{2}Y^{2}}} \right)^{1/2}} + {(A)Y^{4}} + {(B)Y^{6}} + {(C)Y^{8}} + {(D)Y^{10}} + {(E)Y^{12}} + {(F)Y^{14}} + {(G)Y^{16}}}$

[0082] where:

[0083] CURV=1/(Radius of Surface)

[0084] Y=Aperture height, measured perpendicular to optical axis

[0085] K, A, B, C, D, E, F, G=Coefficients

[0086] Z=Position of surface profile for a given Y value, as measuredalong the optical axis from the pole (i.e. axial vertex) of the surface.The coefficients for the surface S13 are: K = −0.1600976 A =  6.9210418e−009 B =   2.2313210e−013 C =   1.1852054e−017 D =−2.0918949e−021 E =   2.2579263e−025 F =   8.1799420e−030 G =−1.2582071e−033 The coefficients for the surface S16 are: K =  0.9059289 A = −4.3564263e−007 B = −1.3760665e−010 C =   1.1349273e−014D = −3.8588303e−017 E =   1.5211558e−020 F = −5.1726796e−025 G =−2.0900671e−027 The coefficients for the surface S19 are: K =   0.0 A =−6.5866466e−008 B = −3.2305127e−011 C = −3.5095033e−014 D =  4.0315700e−017 E = −6.1913043e−021 F = −2.4403843e−023 G =  9.0865109e−027 The coefficients for the surface S20 are: K =   0.0 A =  3.4619978e−008 B =   4.2692157e−011 C = −7.0823340e−014 D =−2.3957687e−017 E =   5.4513203e−020 F = −1.4597367e−023 G =−4.1263059e−027 The coefficients for the surface S30 are: K = −0.8025959A = −3.8556154e−007 B = −5.4410316e−010 C =   7.0427510e−012 D =−8.5740313e−015 E = −5.2635786e−017 F =   1.0608042e−019 G =  7.5783088e−023 The coefficients for the surface S47 are: K =   0.0 A =−1.2184510e−005 B =   1.2115245e−007 C = −3.0828524e−010 D =−5.7252449e−014 E =   0.0 F =   0.0 G =   0.0 The coefficients for thesurface S54 are: K =   0.0 A = −2.743254e−006 B = −2.133804e−009 C =  1.668568e−011 D = −1.9544629e014 E =   0.0 F =   0.0 G =   0.0 Thecoefficients for the surface S70 are: K = −2.3 A =   3.877213e−007 B =  4.916800e−010 C = −1.461192e−012 D = −3.258352e−017 E =  4.664784e−018 F = −4.216175e−021 G =   0.0

[0087] VARIABLE THICKNESS POSITIONS AND DATA P1 P2 P3 P4 P5 P6 P7 EFL7.257 12.152 35.981 82.040 145.068 736.934 2088.142 F/No. 1.450 1.4501.450 1.450 1.450 7.200 12.500 S14 1.026 51.867 122.026 160.824 167.824157.900 167.823 S21 262.564 202.199 103.948 49.493 0.000 34.351 0.000S28 1.563 11.088 39.178 55.576 97.329 72.903 97.329 S58 8.616 8.6168.616 8.616 8.616 99.467 105.316 S66 111.358 111.358 111.358 111.358111.358 53.699 0.000 S69 38.387 38.387 38.387 38.387 38.387 5.195 53.100

[0088] Surface Groups Focal Lengths  S1-S14 283.564 S15-S21 −52.598S22-S28 102.619 S29-S58 51.668 S59-S66 −29.319 S67-S69 178.034 S70-S7770.650

[0089] Surface Group Magnifications Surfaces P1 M′ P1 MP′ P2 M′ P2 MP′P3 M′ P3 MP′ P4 M′  S1-S14 0.000 0.740 0.000 0.564 0.000 0.318 0.000S15-S21 −0.260 7.365 −0.347 6.511 −0.644 6.193 −1.207 S22-S28 −0.3690.833 −0.462 0.740 −0.736 0.466 −0.896 S29-S58 −2.392 −0.356 −2.392−0.356 −2.392 −0.356 −2.392 S59-S66 −0.282 25.995 −0.282 25.995 −0.28225.993 −0.282 S67-S69 14680.000 0.231 14680.000 0.231 14680.000 0.23114680.000 S70-S77 0.000 0.447 0.000 0.447 0.000 0.447 0.000 Surfaces P4MP′ P5 M′ P5 MP′ P6 M′ P6 MP′ P7 M′ P7 MP′  S1-S14 0.179 0.000 0.1170.000 0.174 0.000 0.117 S15-S21 7.342 −1.468 −19.350 −1.150 14.886−1.468 −19.350 S22-S28 0.306 −1.303 −0.101 −1.065 0.137 −1.303 −0.101S29-S58 −0.356 −2.392 −0.356 −2.392 −0.356 −2.392 −0.356 S59-S66 25.994−0.282 25.994 −2.227 0.319 −4.006 0.300 S67-S69 0.231 14680.000 0.231271.410 2.365 81.569 1.386 S70-S77 0.447 0.000 0.447 −0.001 −0.374−0.005 −1.131

[0090] Where, P1 M′ is lens group magnification of lens group whichequals (entrance marginal ray angle)/(exit marginal ray angle) and, P1MP′ is lens group magnification which equals entrance principal rayangle/exit principal ray angle and so on, upto P7 M′ and P7 MP′; thefirst two characters representing position number, for example P1 M′ andP1 MP′ are for position 1. TABLES FOR FIGS. 8A & 8B LENS SYSTEM OPTICALPRESCRIPTION Glass Glass Surface Radius Thickness Index DispersionOBJECT Infinity Infinity S1 −763.589 10.000 1.80099 35.0 S2 408.78315.991 S3 1218.452 22.500 1.49699 81.6 S4 −948.218 0.100 S5 4440.11919.600 1.49699 81.6 S6 −478.965 0.100 S7 355.717 24.300 1.49699 81.6 S8−1197.673 0.100 S9 168.455 28.500 1.49699 81.6 S10 686.627 Variable S11240.261 2.650 1.77249 49.6 S12* 58.196 12.668 S13 307.706 2.900 1.7724949.6 S14 100.924 19.233 S15 −70.095 3.050 1.77249 49.6 S16 236.07514.100 1.84666 23.8 S17 −126.479 Variable S18 −420.335 9.200 1.4969981.6 S19 −81.355 0.126 S20 155.733 15.650 1.49699 81.6 S21 −98.523 2.7501.80099 35.0 S22 −285.204 10.687 S23 76.070 7.900 1.49699 81.6 S24118.043 Variable STOP Infinity 6.800 S26* −35.243 6.500 1.60674 45.1 S2755.360 0.106 S28 55.900 4.050 1.75519 27.5 S29 155.439 4.934 S30 −63.0395.050 1.80518 25.4 S31 −39.609 2.240 S32 56.818 10.900 1.45599 90.3 S33−43.388 2.150 1.80099 35.0 S34 −61.503 2.158 S35 107.501 2.100 1.8009935.0 S36 29.896 11.600 1.49699 81.6 S37 166.103 78.890 S38 59.002 9.6701.83741 25.4 S39 −405.826 20.924 S40 −22.134 19.750 1.80099 35.0 S41−33.299 5.803 S42 −129.563 12.646 1.49699 81.6 S43 −52.914 0.152 S4459.828 5.419 1.49699 81.6 S45 −209.080 0.100 S46 37.693 6.143 1.7409952.7 S47 177.702 Variable S48 −106.846 1.600 1.83480 42.7 S49 21.5766.448 S50 −27.697 6.650 1.80099 35.0 S51 7367.260 0.829 S52 129.2495.126 1.84583 24.0 S53 −46.358 Variable S54 538.505 1.500 1.80099 35.0S55 95.344 11.395 1.60300 65.5 S56 −60.650 Variable S57 87.009 5.1851.48749 70.2 S58 −165.647 1.434 S59 −85.357 1.500 1.80518 25.4 S60−1236.715 0.100 S61 50.007 7.563 1.69472 54.5 S62 549.061 18.000 S63Infinity 13.537 1.51633 64.1 S64 Infinity 2.051 S65 Infinity 33.8411.60859 46.4 S66 Infinity Variable IMAGE Infinity

[0091]$Z = {\frac{({CURV})Y^{2}}{1 + \left( {1 - {\left( {1 + K} \right)({CURV})^{2}Y^{2}}} \right)^{1/2}} + {(A)Y^{4}} + {(B)Y^{6}} + {(C)Y^{8}} + {(D)Y^{10}}}$

[0092] where:

[0093] CURV=1/(Radius of Surface)

[0094] Y=Aperture height, measured perpendicular to optical axis

[0095] K, A, B, C, D=Coefficients

[0096] Z=Position of surface profile for a given Y value, as measuredalong the optical axis from the pole (i.e. axial vertex) of the surface.The coefficients for the surface S12 are: K =   0.0 A = −1.3820532e−007B = −2.7133115e−011 C = −9.2535195e−015 D =   3.3313103e−018 Thecoefficients for the surface S26 are: K = −0.5520119 A = −1.0148386e−006B = −5.9646048e−011 C = −1.3030573e−013 D =   3.2918363e−016

[0097] VARIABLE THICKNESS POSITIONS AND DATA P1 P2 P3 P4 P5 P6 P7 EFL7.274 12.145 36.011 82.004 144.947 738.776 2095.406 F/No. 1.450 1.4501.450 1.450 1.450 9.400 14.100 S10 3.154 50.878 126.861 163.460 167.963167.403 168.654 S17 271.009 213.056 113.646 61.255 10.607 68.828 3.277S24 2.350 12.345 35.982 51.876 97.922 40.276 104.616 S47 4.633 5.4824.658 5.264 6.015 53.226 73.878 S53 105.364 104.868 105.482 104.798103.775 14.725 2.050 S56 1.550 1.550 1.550 1.550 1.550 43.752 35.462 S664.969 4.799 4.853 4.815 5.202 4.818 5.114

[0098] Surface Groups Focal Lengths  S1-S10 262.599 S11-S17 −50.895S18-S24 98.756 S25-S47 37.686 S48-S53 −25.559 S54-S56 106.555 S57-S6281.336

[0099] Surface Group Magnifications Surfaces P1 M′ P1 MP′ P2 M′ P2 MP′P3 M′ P3 MP′ P4 M′  S1-S10 0.000 0.805 0.000 0.626 0.000 0.337 0.000S11-S17 −0.248 7.962 −0.323 7.245 −0.625 7.155 −1.136 S18-S24 −0.3490.734 −0.431 0.633 −0.680 0.394 −0.831 S25-S47 −1.752 −0.293 −1.612−0.293 −1.683 −0.293 −1.613 S48-S53 −0.505 5.934 −0.574 4.957 −0.5325.900 −0.571 S54-S56 −1.558 1.108 −1.529 1.487 −1.539 1.120 −1.533S57-S62 0.233 1.240 0.235 3.217 0.234 1.263 0.234 Surfaces P4 MP′ P5 M′P5 MP′ P6 M′ P6 MP′ P7 M′ P7 MP′  S1-S10 0.191 0.000 0.130 0.000 0.1840.000 0.120 S11-S17 9.531 −1.263 −8.111 −1.246 6.886 −1.285 −6.384S18-S24 0.233 −1.324 −0.233 −0.748 0.350 −1.444 −0.301 S25-S47 −0.293−1.813 −0.293 −1.890 −0.293 −2.412 −0.293 S48-S53 5.176 −0.496 4.492−3.524 0.483 −4.060 0.347 S54-S56 1.378 −1.600 1.750 −1.939 2.244 −1.9041.880 S57-S62 2.205 0.230 −29.370 0.234 −0.833 0.231 −1.610

[0100] Where, P1 M′ is lens group magnification of lens group whichequals (entrance marginal ray angle)/(exit marginal ray angle) and, P1MP′ is lens group magnification which equals entrance principal rayangle/exit principal ray angle and so on, upto P7 M′ and P7 MP′; thefirst two characters representing position number, for example P1 M′ andP1 MP′ are for position 1. TABLES FOR FIGS. 9A & 9B LENS SYSTEM OPTICALPRESCRIPTION Glass Glass Surface Radius Thickness Index DispersionOBJECT Infinity Variable S1 Infinity 50.000 S2 −621.758 5.169 1.6935053.2 S3 457.301 Variable S4 −2452.883 4.799 1.80518 25.4 S5 599.599Variable S6 911.220 25.082 1.45599 90.3 S7 −497.020 0.100 S8 −2000.0000.000 S9 1000.000 0.000 S10 2062.549 12.736 1.49699 81.6 S11 −1165.481Variable S12 963.440 19.740 1.49699 81.6 S13 −560.694 0.200 S14 382.99419.312 1.49699 81.6 S15 −17187.180 0.200 S16 191.959 26.185 1.43875 95.0S17 702.850 0.000 S18 324.818 Variable S19 130.133 3.120 1.77249 49.6S20* 40.551 15.089 S21 87.300 2.500 1.77249 49.6 S22 70.260 14.709 S23−76.831 2.730 1.77249 49.6 S24 108.868 11.313 1.84666 23.8 S25 −166.114Variable S26 2466.515 12.326 1.49699 81.6 S27 −72.273 0.200 S28 114.63917.864 1.49699 81.6 S29 −80.007 3.100 1.80099 35.0 S30 −402.245 0.200S31 56.927 6.364 1.48749 70.2 S32 83.100 Variable STOP Infinity 6.855S34* −32.543 2.000 1.60311 60.7 S35 −178.894 11.407 S36 −41.737 3.2741.84666 23.8 S37 −32.963 0.200 S38 49.510 12.747 1.49699 81.6 S39−39.721 2.400 1.80099 35.0 S40 −53.729 0.200 S41 −163.422 1.850 1.8043939.6 S42 26.111 9.221 1.49699 81.6 S43 −156.748 58.646 S44 44.245 2.5331.80439 39.6 S45 1686.200 39.233 S46 −21.116 6.938 1.77249 49.6 S47−21.969 14.095 S48 92.954 2.220 1.60300 65.5 S49 −59.449 0.200 S5020.331 2.228 1.62229 53.2 S51 47.914 Variable S52 −116.378 0.950 1.8348042.7 S53 34.369 3.756 S54 −16.771 0.950 1.81600 46.6 S55 −36.990 1.142S56 −21.552 17.886 1.78469 26.3 S57 −26.412 Variable S58 −293.612 4.8561.60311 60.7 S59 −78.391 0.200 S60 272.204 5.642 1.49699 81.6 S61−126.344 0.200 S62 124.541 7.681 1.49699 81.6 S63 −102.092 2.500 1.8051825.4 S64 −874.268 0.200 S65 400.000 0.000 S66 38.596 8.430 1.45599 90.3S67 211.910 6.207 S68 Infinity 0.500 S69 123.725 2.000 1.81600 46.6 S7039.478 7.176 S71 −84.356 2.000 1.74099 52.7 S72 36.196 18.326 1.8466623.8 S73 210.724 0.984 S74 Infinity 7.645 S75 105.952 3.999 1.49699 81.6S76 −91.250 0.200 S77 46.317 5.948 1.60300 65.5 S78 −69.543 1.5001.84666 23.8 S79 166.511 22.000 S80 Infinity 13.200 1.51633 64.1 S81Infinity 2.000 S82 Infinity 33.000 1.60859 46.4 S83 Infinity 0.000 S84Infinity 0.000 IMAGE Infinity

[0101]$Z = {\frac{({CURV})Y^{2}}{1 + \left( {1 - {\left( {1 + K} \right)({CURV})^{2}Y^{2}}} \right)^{1/2}} + {(A)Y^{4}} + {(B)Y^{6}} + {(C)Y^{8}} + {(D)Y^{10}}}$

[0102] where:

[0103] CURV=1/(Radius of Surface)

[0104] Y=Aperture height, measured perpendicular to optical axis

[0105] K, A, B, C, D=Coefficients

[0106] Z=Position of surface profile for a given Y value, as measuredalong the optical axis from the pole (i.e. axial vertex) of the surface.The coefficients for the surface S20 are: K = −0.3254663 A =−3.65160e−007 B = −1.14704e−010 C = −5.60564e−014 D = −5.86283e−018 Thecoefficients for the surface S34 are: K =   0.348034 A =   1.350560e−006B =   2.453070e−009 C = −2.820340e−012 D =   4.745430e−015

[0107] VARIABLE THICKNESS POSITIONS AND DATA P1 P2 P3 P4 P5 P6 EFL 7.2787.278 7.278 8.817 12.199 18.641 F/No. 1.749 1.749 1.749 1.749 1.7491.749 SO Infinity 5322.600 2499.900 Infinity Infinity Infinity S3 17.23350.424 82.285 17.233 17.233 17.233 S5 3.856 8.913 13.211 3.856 3.8563.856 S11 74.605 36.357 0.200 74.605 74.605 74.605 S18 0.200 0.200 0.20026.070 64.733 106.272 S25 300.191 300.191 300.191 272.377 230.274183.410 S32 1.334 1.334 1.334 3.266 6.708 12.035 S51 1.647 1.647 1.6471.647 1.647 1.647 S57 80.778 80.778 80.778 80.778 80.778 80.778 P7 P8 P9P10 P11 P12 EFL 32.734 60.449 94.190 123.985 206.250 284.791 F/No. 1.7491.749 1.890 2.020 2.160 2.700 SO Infinity Infinity Infinity InfinityInfinity Infinity S3 17.233 17.233 17.233 17.233 17.233 17.233 S5 3.8563.856 3.856 3.856 3.856 3.856 S11 74.605 74.605 74.605 74.605 74.60574.605 S18 148.849 183.007 201.036 209.783 216.511 215.851 S25 132.06285.948 57.616 42.322 21.856 15.570 S32 20.806 32.763 43.065 49.60963.170 70.310 S51 1.647 1.647 2.130 3.050 8.806 15.438 S57 80.778 80.77880.294 79.375 73.618 66.987 P13 P14 P15 P16 P17 EFL 717.193 2092.1602092.160 2092.160 2092.160 F/No. 5.200 13.750 13.750 13.750 17.490 SOInfinity Infinity 8708.000 4050.000 2499.900 S3 17.233 17.233 37.75959.403 82.285 S5 3.856 3.856 7.178 10.305 13.211 S11 74.605 74.60550.757 25.988 0.200 S18 211.275 208.261 208.261 208.261 208.261 S255.736 0.200 0.200 0.200 0.200 S32 84.680 93.262 93.262 93.262 93.262 S5139.946 82.225 82.225 82.225 82.225 S57 42.480 0.200 0.200 0.200 0.200

[0108] Surface Groups Focal Lengths  S2-S3 −379.209  S4-S5 −597.975 S6-S11 484.131 S12-S18 229.394  S2-S18 262.190 S19-S25 −49.050 S26-S3279.931 S33-S51 41.254 S52-S57 −26.810 S58-S79 70.920

[0109] Surface Group Magnifications Surfaces P1 M′ P1 MP′ P2 M′ P2 MP′P3 M′ P3 MP′ P4 M′ P4 MP′  S2-S3 0.000 1.732 0.066 1.710 0.129 1.6960.000 1.971  S4-S5 0.599 1.754 0.594 1.563 0.59 1.425 0.599 2.388 S6-S11 2.150 0.529 2.229 0.608 2.304 0.682 2.150 0.374 S12-S18 −0.5370.642 −0.537 0.642 −0.537 0.642 −0.537 0.53  S2-S18 0.000 1.030 −0.0471.043 −0.094 1.058 0.000 0.934 S19-S25 −0.185 8.447 −0.185 8.447 −0.1858.447 −0.206 7.952 S26-S32 −0.252 0.756 −0.252 0.756 −0.252 0.756 −0.2520.731 S33-S51 −1.446 −0.378 −1.446 −0.378 −1.446 −0.378 −1.442 −0.378S52-S57 −0.673 6.392 −0.673 6.392 −0.673 6.392 −0.676 6.392 S58-S79−0.611 0.966 −0.611 0.966 −0.611 0.966 −0.611 0.966 Surfaces P5 M′ P5MP′ P6 M′ P6 MP′ P37 M′ P7 MP′ P8 M′ P8 MP′  S2-S3 0.000 2.695 0.0006.440 0.000 −4.655 0.000 −1.279  S4-S5 0.599 −24.64 0.599 −0.414 0.5990.216 0.599 0.403  S6-S11 2.150 −0.033 2.150 −1.271 2.150 −127.8 2.1504.484 S12-S18 −0.537 0.365 −0.537 0.187 −0.537 0.004 −0.537 −0.147 S2-S18 0.000 0.788 0.000 0.633 0.000 0.473 0.000 0.341 S19-S25 −0.2457.233 −0.31 6.531 −0.424 6.046 −0.601 6.421 S26-S32 −0.319 0.688 −0.3860.622 −0.496 0.512 −0.646 0.362 S33-S51 −1.445 −0.378 −1.448 −0.378−1.448 −0.378 −1.449 −0.378 S52-S57 −0.673 6.392 −0.671 6.392 −0.6716.392 −0.67 6.392 S58-S79 −0.611 0.966 −0.612 0.966 −0.612 0.966 −0.6120.966 Surfaces P9 M′ P9 MP′ P10 M′ P10MP′ P11 M′ P11MP′ P12 M′ P12MP′S2-S3 0.000 −0.736 0.000 −0.549 0.000 −0.387 0.000 −0.365 S4-S5 0.5990.468 0.599 0.496 0.599 0.522 0.599 0.526 S6-S11 2.150 3.296 2.150 2.9642.150 2.701 2.150 2.668 S12-S18 −0.537 −0.234 −0.537 −0.279 −0.537−0.330 −0.537 −0.338 S2-S18 0.000 0.265 0.000 0.225 0.000 0.180 0.0000.173 S19-S25 −0.771 8.327 −0.894 11.79 −0.983 −18.95 −1.004 −14.68S26-S32 −0.770 0.233 −0.846 0.152 −1.064 −0.084 −1.092 −0.107 S33-S51−1.431 −0.378 −1.406 −0.378 −1.344 −0.378 −1.359 −0.378 S52-S57 −0.6925.731 −0.728 4.790 −0.916 2.531 −1.194 1.491 S58-S79 −0.611 1.263 −0.6112.227 −0.611 −2.992 −0.610 −1.604 Surfaces P13M′ P13MP′ P14M′ P14MP′P15M′ P15MP′ P16M′ P16MP′  S2-S3 0.000 −0.351 0.000 −0.348 0.041 −0.2940.085 −0.24  S4-S5 0.599 0.529 0.599 0.529 0.596 0.529 0.593 0.529 S6-S11 2.150 2.646 2.150 2.642 2.199 2.691 2.250 2.742 S12-S18 −0.537−0.344 −0.537 −0.345 −0.537 −0.345 −0.537 −0.345  S2-S18 0.000 0.1690.000 0.168 −0.029 0.145 −0.061 0.12 S19-S25 −0.919 −5.386 −0.870 −3.955−0.869 −3.955 −0.869 −3.955 S26-S32 −1.351 −0.287 −1.561 −0.395 −1.561−0.395 −1.561 −0.395 S33-S51 −1.719 −0.378 −2.606 −0.378 −2.61 −0.378−2.612 −0.378 S52-S57 −2.093 0.631 −3.758 0.316 −3.685 0.316 −3.6260.316 S58-S79 −0.613 −1.659 −0.600 −7.955 −0.610 −7.955 −0.619 −7.955Surfaces P17M′ P17MP′ S2-S3 0.129 −0.183 S4-S5 0.590 0.528 S6-S11 2.3042.795 S12-S18 −0.537 −0.345 S2-S18 −0.094 0.093 S19-S25 −0.869 −3.955S26-S32 −1.561 −0.395 S33-S51 −2.612 −0.378 S52-S57 −3.629 0.316 S58-S79−0.618 −7.955

[0110] Where, P1 M′ is lens group magnification of lens group whichequals (entrance marginal ray angle)/(exit marginal ray angle) and, P1MP′ is lens group magnification which equals entrance principal rayangle/exit principal ray angle and so on, upto P17 M′ and P17 MP′; thefirst two characters representing position number, for example P1 M′ andP1 MP′ are for position 1.

[0111] The group of elements defined by surface 69 through 73 istranslated in a direction perpendicular to the optical axis tocompensate for image vibration

[0112] In the lens system optical prescriptions provided above for eachof the four embodiments, each surface of a lens element identified inthe left hand column (“Surface”), the radius of that surface in thesecond column (“Radius”), the thickness on the optical axis between thatsurface and the next surface, whether glass or air, in the third column(“Thickness”), the refractive indices of the glass lens elements setforth in the fourth column (“Glass Index”), and the dispersion valuesfor the lens elements (“Glass Dispersion”) set forth in the fifthcolumn. The surface numbers in the first column “Surface” represent thesurfaces numbered from left-to-right in the Figs. in the conventionalmanner, namely from object space to image space.

[0113] In the left hand or “Surface” column of each lens system opticalprescription provided above, the object to be imaged (e.g.,photographed) is identified as “OBJECT”, the adjustable iris or stop isidentified as “STOP”, and the final image is identified as “IMAGE”. Theadjustable spaces between lens elements, such as on either side ofmovable zoom groups, are identified as “Variable” in the third orThickness column of the lens system optical prescription. The EFL,Radius and Thickness dimensions are given in millimeters with theThickness being the distance after that surface on the optical axis.When two surfaces of adjacent elements have the same radius and arecoincident, as in a doublet or triplet, only one surface is identifiedin the first or “Surf” column.

[0114] For each of the four embodiments, Aspheric Coefficients for eachof the aspheric surfaces are provided following the table of opticalprescriptions.

[0115] In addition, for each of the four embodiments, tables of thevariable thickness positions for various surfaces in each lens systemoptical prescription are provided which identify positions in the format“Px” for various surfaces (corresponding to entries in the Surfacecolumn of the optical prescription tables). The effective focal length(EFL) and the “f” number (F/No.) are also provided for each position.

[0116] Now each of the four embodiments of FIGS. 6A-9B will be describedbriefly to identify some of their differences. The embodiment of FIGS.6A and 6B has an effective focal length range of about 7.25 mm to 900mm, which provides a zoom ratio of about 125:1, while using threemovable zoom lens groups, namely, Zoom 1, Zoom 2, and Zoom 3, with afocus lens group Focus at the object space end of the lens. The Zoom 3group actually is comprised of two groups of elements that have a smallamount of movement between surfaces S47 and S48 (compare FIGS. 6A and6B). The embodiment of FIGS. 7A and 7B has an effective focal lengthrange of about 7.27 mm to 2088 mm, which provides a zoom ratio of about287:1, with four movable zoom lens groups (Zoom 1, 2, 3 and 4) and afocus lens group. The embodiment of FIGS. 8A and 8B has an effectivefocal length range of about 7.27 mm to 2095 mm, which also provides azoom range of about 287:1, with four moving zoom lens groups and a focuslens group, which is very similar to the performance of the lensembodiment of FIGS. 7A and 7B. Similarly, the embodiment of FIGS. 9A and9B has an effective focal length range of about 7.27 mm to 2092 mm,which also provides a zoom ratio of about 287:1, but uses only threemoving zoom lens groups. Each of these four embodiments includes pluralaspheric surfaces with the embodiments of the FIGS. 8A-8B and 9A-9Bhaving only two such surfaces while the embodiment of FIGS. 7A-7Bincludes eight such surfaces, as indicated in the lens system opticalprescriptions. The embodiment of FIGS. 9A and 9B also includes opticalimage stabilization lens elements near the camera end of the lens systemsimilar to those included in the embodiment of FIGS. 10-62, which willbe described below.

[0117] Detailed Description of the Embodiment of FIGS. 10-62. As notedabove in the section entitled “Brief Description of the Drawings,” FIGS.10-62 all relate to a single embodiment of the present invention that isdirectly and immediately applicable to the broadcast television market,although other markets are also available and various other embodimentsand modifications of the invention may be more applicable to othermarkets. This embodiment of the compound zoom lens system of thisinvention has a zoom range of approximately 7 mm to 2100 mm in focallength, thereby providing a zoom ratio of about 300:1, which is morethan three times the zoom ratio presently available in broadcasttelevision zoom lens systems. Referring more particularly to the opticaldiagram of FIG. 10, the zoom lens system ZL is comprised of a focus lensgroup FG, a front zoom group FZG and a rear zoom group RZG. For thedescription of this embodiment, the lens system's stop is used as adivider between the “front” and “rear” of the lens. In terms of theterminology used in the “Description of Various Features of theInvention and the Disclosed Embodiments” set forth above, the focus lensgroup FG is the focus unit, the front zoom group FZG is the firstoptical unit, and the rear zoom group RZG includes a pupil imaging unitand an image stabilization unit, as well as the second optical unit.

[0118] The focus group FG is comprised of seven lens elements 1-7 withthe front lens element 1 being stationary whereby the lens may be sealedat the front by fixing and sealing element 1 to the lens barrel (notshown). Lens element 2 comprises a first focus group FG1 and lenselements 3 and 4 comprise a second focus group FG2, both of which groupsare independently movable for achieving the desired focus at each focallength. Elements 5-7 of the focus group FG are stationary.

[0119] The front zoom group FZG has a first zoom group ZG1 comprised oflens elements 8-11 and a second zoom group ZG2 comprised of lenselements 12-15, both of which zoom groups are independently movable. Aniris or aperture stop STOP is positioned between the second zoom groupZG2 and a first group RG1 that forms the front portion of the rear zoomgroup RZG.

[0120] First group RG1 is comprised of lens elements 16-25, which remainstationary. The intermediate image is formed between lens elements 22and 23 in the first group RG1. Although all of the lens elements 16-25of this first group RG1 remain stationary at all times, the intermediateimage moves along the optical axis between lens elements 22 and 23 atthe longer focal lengths without touching either of those elementsduring the zooming of the lens system between the maximum and minimumfocal lengths. The next lens group of the rear zoom group RZG is a thirdzoom group ZG3 comprised of lens elements 26-28 that are movableaxially. Next within the rear zoom group RZG is a second group RG2comprised of lens elements 29-33, which are stationary. The nextelements in the rear zoom group RZG comprise a stabilization group SGhaving a radial decentralization group SG1 with lens elements 34-36 andan axially adjustable group SG2 with lens elements 37-39. The three zoomgroups ZG1, ZG2 and ZG3 are independently movable along the optical axisfor developing the full range of the focal lengths of about 7 mm to 2100mm. Finally, although they are not part of the zoom lens system per se,FIG. 10 also illustrates two prism blocks 40 and 41 that emulate theconventional three CCD ⅔″ detectors of a video camera for completing theoptical diagram from object space to the final image.

[0121] The first or decentralization stabilization group SG1 is movableradially from the system's optical axis in any direction by about 0.5 mmor more in response to sensed vibrations of the lens to maintain thefinal image at the image plane in a stabilized location. The sensing ofvibrations and the movement of group SG1 may be accomplished by anyconventional means such as an accelerometer, a processor and a motorcontrolled by the processor in a closed loop system on a continuousbasis. The second or axial stabilization group SG2 is axially movablefor axial adjustment of about 1.25 mm or more in either direction forback focus adjustment. The second stabilization group SG2 may also bemoved axially forward a greater amount for extended close focus at shortfocal lengths of the lens. The light rays between the firststabilization group SG1 and the second stabilization group SG2, i.e.between lens elements 36 and 37, are substantially collimated wherebythe movements of those two groups for accomplishing stabilization,extending the close focus and adjusting the back focus do not cause anysignificant deterioration of the final image.

[0122] The decentralization stabilization group SG1 may also be used forcreating special effects by causing the lens group SG1 to move radiallyin a shaking pattern to thereby simulate the shaking caused, forexample, by an earthquake, a moving vehicle or explosions in a warmovie. Such special effects can also be produced by moving the lensgroup SG2 axially in an oscillatory fashion, which slightly defocusesthe picture. Radial movement of SG1 can also be combined with axialmovement of SG2 to create a different special effect.

[0123] The complete lens design of the zoom lens system ZL for theembodiment of FIGS. 10-62 is set forth below in the tables generallyentitled “Tables for FIGS. 10 thru 62.” The Lens System OpticalPrescription table is similar to the foregoing lens prescriptions forthe zoom lenses of FIGS. 6A-9B. A more detailed explanation of thetables is provided following the tables. TABLES FOR FIGS. 10 thru 62LENS SYSTEM OPTICAL PRESCRIPTION Glass Manu- Semi Surface RadiusThickness Name facturer Aperture OBJECT Infinity Variable S1 Infinity50.000 142.85 S2 −553.385 5.200 SLAL13 OHARA 111.77 S3 436.730 Variable103.81 S4 −1545.910 4.900 STIH6 OHARA 102.97 S5 682.341 Variable 101.63S6 1644.762 19.482 SFPL52 OHARA 101.59 S7 −467.261 0.730 101.38 S8−2000.000 0.000 99.83 S9 4000.000 0.000 99.22 S10 1463.863 12.601 SFPL51OHARA 98.87 S11 −1094.948 Variable 98.22 S12 1092.461 20.386 SFPL51OHARA 100.60 S13 −480.155 0.730 101.05 S14 362.425 21.232 SFPL51 OHARA101.85 S15 −14624.000 0.730 101.37 S16 181.063 24.150 SFPL53 OHARA 97.84S17 477.885 0.000 96.42 S18 324.818 Variable 95.12 S19 208.678 3.120SLAH66 OHARA 38.27 S20* 40.147 6.111 32.19 S21 67.136 3.150 SLAH59 OHARA32.03 S22 56.870 14.527 30.64 S23 −98.690 2.730 SLAH66 OHARA 30.54 S2490.992 12.506 STIH53 OHARA 33.74 S25 −174.619 Variable 34.43 S26 764.77114.926 SFPL52 OHARA 36.34 S27 −66.842 0.400 36.91 S28 133.738 17.704SFPL51 OHARA 36.84 S29 −69.988 3.100 SLAM66 OHARA 36.62 S30 −1580.2210.400 36.97 S31 65.214 9.613 SNSL36 OHARA 37.33 S32 129.561 Variable36.67 STOP Infinity 8.811 20.27 S34* −36.392 2.044 SBSM14 OHARA 20.44S35 −425.016 6.131 21.70 S36 −43.308 5.233 STIH53 OHARA 21.88 S37−33.861 0.200 22.78 S38 47.203 13.980 SFPL51 OHARA 22.84 S39 −41.5652.400 SLAM66 OHARA 22.59 S40 −56.845 0.200 22.47 S41 −109.533 1.950SLAH63 OHARA 21.13 S42 31.532 10.159 SFPL51 OHARA 19.56 S43 −173.40345.721 19.51 S44 47.891 4.513 SLAH53 OHARA 15.23 S45 −2514.287 41.84314.84 S46 −23.807 9.483 SLAH59 OHARA 8.45 S47 −24.610 12.719 9.87 S4861.223 3.114 SFPL51 OHARA 8.86 S49 −45.071 0.150 8.71 S50 24.918 3.242SBSM9 OHARA 8.83 S51 −516.606 Variable 8.67 S52 −72.073 1.059 SLAL54OHARA 7.15 S53 23.513 2.783 6.65 S54 −18.951 0.900 SLAH59 OHARA 6.54 S55−57.174 1.347 6.84 S56 −21.150 21.292 SLAH60 OHARA 6.98 S57 −31.181Variable 12.67 S58 −138.459 4.401 SBAL22 OHARA 23.12 S59 −75.648 0.30023.54 S60 606.713 5.842 SFPL51 OHARA 23.89 S61 −96.488 0.300 23.97 S62113.288 7.382 SFPL51 OHARA 23.55 S63 −97.742 2.500 STIH6 OHARA 23.30 S64−366.723 0.300 23.05 S65 400.000 0.000 22.80 S66 38.760 8.585 SFPL52OHARA 21.88 S67 269.438 5.901 21.07 S68 115.000 0.450 18.30 S69 94.0721.770 SLAL54 OHARA 18.00 S70 35.982 7.000 16.65 S71 −90.502 2.010 SLAL8OHARA 16.35 S72 29.972 6.150 STIH53 OHARA 16.01 S73 82.308 2.725 15.75S74 79.000 9.670 15.78 S75 76.232 6.100 SPHM52 OHARA 15.87 S76 −75.0030.761 15.66 S77 45.420 7.170 SFSL5 OHARA 14.38 S78 −45.317 1.500 STIH53OHARA 13.58 S79 348.342 18.544 12.98 S80 Infinity 13.200 SBSL7 OHARA10.30 S81 Infinity 2.000 9.00 S82 Infinity 33.000 BAF52 SCHOTT 8.70 S83Infinity 0.000 5.69 S84 Infinity 0.000 IMAGE Infinity 0.000

[0124]$Z = {\frac{({CURV})Y^{2}}{1 + \left( {1 - {\left( {1 + K} \right)({CURV})^{2}Y^{2}}} \right)^{1/2}} + {(A)Y^{4}} + {(B)Y^{6}} + {(C)Y^{8}} + {(D)Y^{10}}}$

[0125] where:

[0126] CURV=1/(Radius of Surface)

[0127] Y=Aperture height, measured perpendicular to optical axis

[0128] K, A, B, C, D=Coefficients

[0129] Z=Position of surface profile for a given Y value, as measuredalong the optical axis from the pole (i.e. axial vertex) of the surface.The coefficients for the surface S20 are: K = −0.3564030 A =−8.06827e−07 B = −2.15109e−10 C = −6.36649e−14 D = −3.89379e−18 Thecoefficients for the surface S34 are: K =   0.4304790 A =   9.57697e−07B =   1.31318e−09 C = −1.45592e−12 D =   3.19536e−15

[0130] VARIABLE THICKNESS POSITIONS AND DATA P1 P2 P3 P4 P5 P6 P7 EFL7.391 8.820 12.231 19.219 32.730 64.634 −93.220 F/No. 1.949 1.949 1.9491.949 1.949 1.949 2.010 S0 Infinity Infinity 5322.630 2499.896 Infinity5322.630 Infinity S3 19.882 19.882 49.699 78.333 19.882 49.699 19.882 S55.690 5.690 10.880 15.384 5.690 10.879 5.690 S11 71.522 71.522 36.5163.376 71.522 36.516 71.522 S18 1.350 26.428 67.051 110.745 155.094189.151 203.856 S25 319.660 292.522 247.857 197.854 142.790 92.65365.474 S32 9.625 11.684 15.727 22.036 32.751 48.830 61.304 S51 1.4981.498 1.498 1.498 1.498 1.498 2.823 S57 63.257 63.257 63.257 63.25763.257 63.257 61.933 P8 P9 P10 P11 P12 P13 P14 EFL 145.184 206.228490.401 717.511 2065.045 −3694.934 −920.968 F/No. 2.090 2.360 2.8405.600 13.064 13.064 13.064 S0 5322.630 Infinity 5322.630 InfinityInfinity 8708.002 4050.000 S3 49.699 19.882 49.699 19.882 19.882 38.42857.882 S5 10.879 5.690 10.879 5.690 5.690 9.057 12.294 S11 36.516 71.52236.516 71.522 71.522 49.608 26.917 S18 210.392 215.814 218.877 223.339224.980 224.980 224.980 S25 50.046 33.074 24.338 10.235 1.719 1.7191.719 S32 70.197 81.746 87.419 97.063 103.934 103.934 103.934 S51 4.7119.572 14.559 31.080 63.536 63.536 63.536 S57 60.044 55.183 50.196 33.6751.220 1.220 1.220 P15 P16 P17 P18 P19 P20 EFL −509.031 −1739.084−387.928 7.227 114.357 377.554 F/No. 16.750 5.600 5.600 1.949 2.0102.360 S0 2499.896 5322.630 2499.896 2499.896 2499.896 2499.896 S3 78.33349.699 78.333 78.333 78.333 78.333 S5 15.384 10.879 15.384 15.384 15.38415.384 S11 3.376 36.516 3.376 3.376 3.376 3.376 S18 224.980 223.339223.339 1.350 203.856 215.814 S25 1.719 10.235 10.235 319.660 65.47433.074 S32 103.934 97.063 97.063 9.625 61.304 81.746 S51 63.536 31.08031.080 1.498 2.823 9.572 S57 1.220 33.675 33.675 63.257 61.933 55.183

[0131] Surface Groups Focal Lengths  S2-S3 −349.648  S4-S5 −581.962 S6-S7 798.201 S10-S11 1258.758 S12-S13 672.072 S14-S15 709.848 S16-S17646.676 S19-S20 −64.565 S21-S22 −526.211 S23-S25 −554.999 S26-S27135.208 S28-S30 113230.702 S31-S32 240.348 S34-S35 −65.863 S36-S37144.623 S38-S40 60.255 S41-S43 −70.987 S44-S45 58.010 S46-S47 205.873S48-S49 52.593 S50-S51 38.634 S52-S53 −27.000 S54-S55 −34.933 S56-S57−2495.053 S58-S59 284.851 S60-S61 167.476 S62-S64 292.466 S66-S67 97.878S69-S70 −90.217 S71-S73 −72.295 S75-S76 61.902 S77-S79 1261.227 S80-S81Infinity S82-S83 Infinity

[0132] The Lens System Optical Prescription table comprises the“Listing” for the lens specification and numerically lists each lens“SURFACE” in the left-hand column, but also includes dummy surfaces usedin the design such as dummy surfaces S1, S8, S9, S18, S65, S74 and S84.The second column “Radius” lists the radius of the respective surfaceswith a negative radius indicating that the center of curvature is to theleft. The third column “Thickness” lists the thickness of the lenselement or space from that surface to the next surface on the opticalaxis. The fourth column “Glass Name” lists the type of glass and thefifth column “Manufacturer” lists the manufacturer of each glassmaterial. The fifth column “Semi Aperture” provides a measurement ofhalf the aperture diameter for each lens element.

[0133] In the left-hand column the legend “OBJECT” means the object tobe imaged (e.g., photographed), the legend “STOP” means the iris orstop, and the legend “IMAGE” means the final image. Each of the surfacesis identified by a numeral preceded by “S” to distinguish the surfacesfrom the numerals that identify the lens elements set forth on thesubsequent pages comprising the 39 glass lens elements described abovewith respect to FIG. 10 and prisms 40 and 41 of the detector.

[0134] It should be noted that each of the thickness dimensions setforth in the third column of the table listing the surfaces is theelement thickness or air space along the optical axis for the zoom lenssystem ZL set to the shortest focal lens (7.39 mm EFL) and focused atinfinity. The air spaces adjacent the moving lens groups obviously willchange in “thickness” for other focal lengths and focus distances.

[0135] For each aspheric surface, Aspheric Coefficients are providedfollowing the table of optical prescriptions.

[0136] FIGS. 11-30 illustrate 20 representative positions for the zoomlens system of FIG. 10. These 20 positions are listed in the followingTable of Lens Positions: TABLE OF LENS POSITIONS Paraxial EFL FocusDistance (mm) To Object* (mm) @ Infinity Focus “F” No. INF. 8758 53724100 2550 7.3909 1.95 1 18 8.8200 1.95 2 12.1938 1.95 3 18.6371 1.95  432.7300 1.95 5 60.2959 1.95 6 93.2199 2.01 7 19 127.2902 2.09 8 206.22782.36 9 20 297.4279 2.84 10 717.5114 5.60 11 16 17 2065.0447 13.06 12 1314  15#

[0137] The twenty (20) positions were selected as representative ofextreme positions of focal length and focus distance, as well asintermediate positions, for establishing the representative performancesof the zoom lens system ZL of FIG. 10. In other words, position 1 is atthe minimum paraxial focal length (wide angle) of about 7.4 mm andfocused at infinity whereas position 18 is focused at 2550 mm (abouteight feet) for the same focal length. Similarly, position 12 representsthe longest paraxial focal length of about 2065 mm at infinity focuswhereas position 15 represents the focus at 2550 mm at the same paraxialfocal length. The paraxial EFL in the first column is at infinity focus.The “f” numbers are at any given focus and at full aperture. The 12different focal lengths provide representative focal lengths over thefull range of the zoom lens system ZL. Also, it should be noted that theactual field of view as a result of distortion and the availablephysical overtravel of the zoom groups beyond data in the lens systemoptical prescription set forth below produces an apparent focal lengthrange of substantially 7.0 mm to 2100 mm, i.e. a zoom ratio of about300:1, with the distortion primarily influencing the reduction in theminimum paraxial EFL and the overtravel primarily influencing theincrease in the maximum paraxial EFL. At 2100 mm EFL with focus set ateight feet, the magnification is about 1.33:1.00 (object to image size).The nominal lens design for the embodiment of FIGS. 10-62 as reflectedin the lens optical prescription tables for FIGS. 10-62 is given at 77°F. (25° C., 298 K) and standard atmospheric pressure (760 mm Hg).

[0138] Referring now to FIGS. 11-30, the twenty positions 1-20 set forthin the foregoing lens system optical prescription and the precedingTABLE OF LENS POSITIONS are shown in that order. For example, FIG. 11 isan optical diagram of the lens elements in Position 1, namely, aparaxial effective focal length (EFL) of 7.391 mm and focused atinfinity, wherein the first and second focus groups FG1 and FG2 areclosely separated, the first and second zoom groups ZG1 and ZG2 arewidely separated, and the third zoom group ZG3 is in its most forwardposition. On the other hand, FIG. 25 is the optical diagram representingPosition 15 with the largest focal length and shortest focus distance,wherein the first and second focus groups FG1 and FG2 are both in theirrearmost position, the first and second zoom groups ZG1 and ZG2 are in aclosely spaced position but intermediately spaced between adjacent lensgroups, and the third zoom group ZG3 is in the rearmost position.

[0139] FIGS. 31-34 are enlarged optical diagrams of only the seven focusgroup FG elements 1-7 and illustrate representative Positions 1, 18, 12and 15, respectively. It should be noted that while the lens elementpositions in FIGS. 32 and 34 are the same, representing the focusdistance of 2550 mm, the ray tracings are different because of thedifference in the paraxial focal lengths from the minimum of about 7.4mm in FIG. 32 to the maximum of about 2065 mm in FIG. 34.

[0140]FIGS. 35 and 36 are enlarged optical diagrams illustrating thelast lens element 7 of the focus group FG and the first and second zoomgroups ZG1 and ZG2 in Positions 1 and 12, respectively, for the minimumand maximum paraxial focal lengths, respectively. Similarly, FIGS. 37and 38 represent the rear zoom group RZG with the third zoom group ZG3in the forwardmost and rearmost Positions 1 and 12 representing theminimum and maximum paraxial focal length positions, all respectively.

[0141] Referring now to FIGS. 39-58, the ray aberration graphs forPositions 1-20, respectively, are shown in a conventional manner by fiveseparate graphs with the maximum field height at the top and zero fieldheight at the bottom and for five wavelengths, as listed thereon. Aswill readily appear to those skilled in the art, these performancecurves establish that in all 20 positions the zoom lens system performsexceptionally well for current broadcast television NTSC quality andexceptionally well for HDTV broadcast television quality. While FIG. 50representing Position 12, illustrates wide variations in the rayaberrations at this focal length and focused at infinity, theperformance is satisfactory because the modulation transfer function isclose to the diffraction limit. Similarly, FIGS. 52 and 53, representingPositions 14 and 15, respectively, illustrate widely varying rayaberrations but are still acceptable relative to diffraction limits forthese close focus and long focal length positions.

[0142] Referring now to FIG. 59, the cam graph for the first and secondfocus groups FG1 and FG2 are shown (left and right, respectively) forthe full range of focus travel thereof from infinity to close focus,with object space being to the left. The first and second focus groupsFG1 and FG2 move separately and not at precisely the same rate, eventhough the solid cam lines in FIG. 59 look nearly parallel. Thecrosshatched portions at the top and bottom of FIG. 59 allow fortemperature changes, manufacturing tolerances and fabricationadjustments. Similarly, FIG. 60 illustrates the cam graphs for the threezoom groups ZG1, ZG2 and ZG3 from left to right, respectively, and it isreadily apparent that all three zoom groups move independently, althoughcoordinated to achieve the desired focal lengths continuously over theentire range. FIG. 61 is a graph of the “f” number of the open stoprelative to the paraxial effective focal length. Similarly, FIG. 62 is agraph of the full aperture full stop diameter relative to the paraxialeffective focal length throughout the full range thereof.

[0143] Detailed Description of Other Embodiments. FIGS. 63 and 64illustrate an example of another embodiment of the present invention.This embodiment of the zoom lens system is very similar to theembodiment of FIGS. 8A and 8B, except that a binary (diffractive)surface is provided. Specifically, a binary surface is provided on thefront surface (surface No. 3 in the prescription) of the second lenselement. The lens system optical prescription is set forth below in thetables generally entitled “Tables for FIGS. 63 and 64.” A more detailedexplanation of the tables is provided following the tables. TABLES FORFIGS. 63 and 64 LENS SYSTEM OPTICAL PRESCRIPTION Glass Surface RadiusThickness Name OBJECT Infinity Infinity S1 −731.222 10.000 LASF32 S2390.798 15.991 S3# 827.075 22.500 BK7 S4 −1021.418 0.100 S5 1257.46319.600 BK7 S6 −780.160 0.100 S7 436.979 24.300 BK7 S8 −835.454 0.100 S9170.301 28.500 BK7 S10 655.827 Variable S11 278.083 2.650 S-LAH66 S12*60.022 12.668 S13 277.706 2.900 S-LAH66 S14 98.325 19.233 S15 −70.1053.050 S-LAH66 S16 234.965 14.100 S-TIH53 S17 −127.001 Variable S18−404.763 9.200 S-FPL51 S19 −80.933 0.126 S20 157.360 15.650 S-FPL51 S21−99.532 2.750 S-LAM66 S22 −284.625 10.687 S23 76.300 7.900 S-FPL51 S24118.669 Variable STOP Infinity 6.800 S26* −34.999 6.500 BAF4 S27 54.4350.106 S28 54.347 4.050 S-TIH4 S29 158.504 4.934 S30 −64.093 5.050 S-TIH6S31 −39.812 2.240 S32 56.945 10.900 S-FPL52 S33 −43.914 2.150 S-LAM66S34 −61.923 2.158 S35 106.356 2.100 S-LAM66 S36 30.350 11.600 S-FPL51S37 151.277 78.890 S38 57.056 9.670 SF6 S39 −603.641 20.924 S40 −22.69319.750 S-LAM66 S41 −34.224 5.803 S42 −129.563 12.646 S-FPL51 S43 −52.9140.152 S44 59.828 5.419 S-FPL51 S45 −209.080 0.100 S46 37.693 6.143S-LAL61 S47 177.702 Variable S48 −106.846 1.600 S-LAH55 S49 21.576 6.448S50 −27.697 6.650 S-LAM66 S51 7367.260 0.829 S52 129.249 5.126 S-TIH53S53 −46.358 Variable S54 538.505 1.500 S-LAM66 S55 95.344 11.395 S-PHM53S56 −60.650 Variable S57 87.009 5.185 S-FSL5 S58 −165.647 1.434 S59−85.357 1.500 S-TIH6 S60 −1236.715 0.100 S61 50.067 7.563 S-LAL14 S62539.692 18.000 S63 Infinity 13.537 S-BSL7 S64 Infinity 2.051 S65Infinity 33.841 BAF52 S66 Infinity Variable IMAGE Infinity

[0144]$Z = {\frac{({CURV})Y^{2}}{1 + \left( {1 - {\left( {1 + K} \right)({CURV})^{2}Y^{2}}} \right)^{1/2}} + {(A){Y4}} + {(B)Y^{6}} + {(C)Y^{8}} + {(D)Y^{10}}}$

[0145] where:

[0146] CURV=1/(Radius of Surface)

[0147] Y=Aperture height, measured perpendicular to optical axis

[0148] K, A, B, C, D=Coefficients

[0149] Z=Position of surface profile for a given Y value, as measuredalong the optical axis from the pole (i.e. axial vertex) of the surface.The coefficients for the surface S12 are: K =   0.01925737 A =−1.3531387e−007 B = −1.5274225e−011 C = −2.0209982e−014 D =  5.4753514e−018 The coefficients for the surface S26 are: K =−0.5574845 A = −1.0833227e−006 B = −9.1904879e−011 C = −1.4775967e−013 D=   6.5701323e−016

Added Phase=A ₁ p ² +A ₂ p ⁴ +A ₃ p ⁶ +A ₄ p ⁸ +A ₅ p+HU10

[0150] where: A₁, A₂, A₃, A₄ and A₅ are coefficients and p is thenormalized radial coordinate at the surface. The normalizing factor isset at unity and the p's become simply radial coordinates. A1 =−0.14123699 A2 = −8.7028052e−007 A3 = −1.2255122e−010 A4 =  5.9987370e−015 A5 = −1.2234791e−019

[0151] VARIABLE THICKNESS POSITIONS AND DATA P1 P2 P3 P4 P5 P6 P7 EFL7.264 12.117 35.980 81.979 145.198 729.922 2100.036 F/No. 1.450 1.4501.450 1.450 1.450 9.400 14.100 S10 3.154 50.878 126.861 163.460 167.963167.403 168.654 S17 271.009 213.056 113.646 61.255 10.607 68.828 3.277S24 2.350 12.345 35.982 51.876 97.922 40.276 104.616 S47 4.632 5.4824.658 5.264 6.015 53.226 73.878 S53 105.364 104.868 105.482 104.798103.775 14.725 2.050 S56 1.550 1.550 1.550 1.550 1.550 43.752 35.462 S664.969 4.799 4.853 4.815 5.202 4.818 5.114

[0152] The prescription of binary surface 3 is included following thelens system optical prescription table listed above. The binary surface3 adds phase to the wavefront. By providing binary surface 3, the secondthrough fifth lens elements 2, 3, 4 and 5 in the focus portion of thelens can be made from relatively inexpensive glass, such as BK7, ratherthan expensive optical glass having abnormal dispersion characteristics,such as SFPL 51. While it is advantageous to include this binary surface3 near the front of the lens system where the axial beam diameters arelargest, it will readily appear to those skilled in the art that thebinary (diffractive) surface may be provided elsewhere and that morethan one such surface may be provided. Other methods of aberrationcorrection may also be used advantageously. It should be noted that thisembodiment also incorporates two aspheric surfaces 12 and 26.

[0153]FIG. 63 shows the zoom lens system with the zoom groups positionedat the longest focal length and the focus group focused at infinity.Similarly, the ray aberration graphs of FIG. 64 are at infinity focusand maximum focal length. It should be noted that the use of a binarysurface in this embodiment is a modification that may be used in any ofthe embodiments of the invention disclosed herein or future variationsof the invention.

[0154]FIGS. 65 and 66 illustrate an example of another embodiment of thepresent invention. This embodiment of the zoom lens system of thepresent invention is very similar to the embodiment of FIGS. 10-62,except that a binary (diffractive) surface is provided. Specifically,the binary surface is provided on the front surface (surface No. 6 inthe prescription) of the third lens element from the left. As describedabove with respect to FIGS. 10-62, that third lens element is the first(front) of two lens elements comprising the second focus group FG2,which is movable axially for accomplishing the focusing together withthe movable first focus group FG1 comprised of only the second lenselement. The lens system optical prescription for the embodiment ofFIGS. 65 and 66 is set forth below in the tables generally entitled“Tables for FIGS. 65 and 66.” TABLES FOR FIGS. 65 and 66 LENS SYSTEMOPTICAL PRESCRIPTION Glass Surface Radius Thickness Name OBJECT InfinityVariable S1 Infinity 50.000 S2 −617.930 5.200 S-LAM60 S3 425.207Variable S4 −2291.780 4.900 S-TIH6 S5 545.459 Variable S6# 961.46719.482 BK7 S7 −607.161 0.730 S8 1355.262 12.601 BK7 S9 −1118.653Variable S10 986.310 20.386 S-FPL51 S11 −502.874 0.730 S12 343.82621.232 S-FPL51 S13 64586.450 0.730 S14 181.736 24.150 S-FPL53 S15476.848 Variable S16 208.678 3.120 S-LAH66 S17* 40.147 6.111 S18 67.1363.150 S-LAH59 S19 56.870 14.527 S20 −98.690 2.730 S-LAH66 S21 90.99212.506 S-TIH53 S22 −174.619 Variable S23 764.771 14.926 S-FPL52 S24−66.842 0.400 S25 133.738 17.704 S-FPL51 S26 −69.988 3.100 S-LAM66 S27−1580.221 0.400 S28 65.214 9.613 S-NSL36 S29 129.561 Variable STOPInfinity 8.811 S31* −36.392 2.044 S-BSM14 S32 −425.016 6.131 S33 −43.3085.233 S-TIH53 S34 −33.861 0.200 S35 47.203 13.980 S-FPL51 S36 −41.5652.400 S-LAM66 S37 −56.845 0.200 S38 −109.533 1.950 S-LAH63 S39 31.53210.159 S-FPL51 S40 −173.403 45.721 S41 47.891 4.513 S-LAH53 S42−2514.287 41.843 S43 −23.807 9.483 S-LAH59 S44 −24.610 12.719 S45 61.2233.114 S-FPL51 S46 −45.071 0.150 S47 24.918 3.242 S-BSM9 S48 −516.606Variable S49 −72.073 1.059 S-LAL54 S50 23.513 2.783 S51 −18.951 0.900S-LAH59 S52 −57.174 1.347 S53 −21.150 21.292 S-LAH60 S54 −31.181Variable S55 −138.459 4.401 S-BAL22 S56 −75.648 0.300 S57 606.713 5.842S-FPL51 S58 −96.488 0.300 S59 113.288 7.382 S-FPL51 S60 −97.742 2.500S-TIH6 S61 −366.723 0.300 S62 400.000 0.000 S63 38.760 8.585 S-FPL52 S64269.438 5.901 S65 115.000 0.450 S66 94.072 1.770 S-LAL54 S67 35.9827.000 S68 −90.502 2.010 S-LAL8 S69 29.972 6.150 S-TIH53 S70 82.308 2.725S71 79.000 9.670 S72 76.232 6.100 S-PHM52 S73 −75.003 0.761 S74 45.4207.170 S-FSL5 S75 −45.317 1.500 S-TIH53 S76 348.342 18.544 S77 Infinity13.200 S-BSL7 S78 Infinity 2.000 S79 Infinity 33.000 BAF52 S80 Infinity0.000 S81 Infinity 0.000 IMAGE Infinity

[0155]$Z = {\frac{({CURV})Y^{2}}{1 + \left( {1 - {\left( {1 + K} \right)({CURV})^{2}Y^{2}}} \right)^{1/2}} + {(A)Y^{4}} + {(B)Y^{6}} + {(C)Y^{8}} + {(D)Y^{10}}}$

[0156] where:

[0157] CURV=1/(Radius of Surface)

[0158] Y=Aperture height, measured perpendicular to optical axis

[0159] K, A, B, C, D=Coefficients

[0160] Z=Position of surface profile for a given Y value, as measuredalong the optical axis from the pole (i.e. axial vertex) of the surface.The coefficients for the surface S17 are: K = −0.3564029 A =−8.6827410e−007 B = −2.1510889e−010 C = −6.3664850e−014 D =−3.8937870e−018 The coefficients for the surface S31 are: K =  0.4304792 A =   9.5769727e−007 B =   1.3131850e−009 C =−1.4559220e−012 D =   3.1953640e−015

Added Phase=A ₁ p ² +A ₂ p ⁴ +A ₃ p ⁶ +A ₄ p ⁸ +A ₅ p+HU10

[0161] where: A₁, A₂, A₃, A₄ and A₅ are coefficients and p is thenormalized radial coordinate at the surface. The normalizing factor isset at unity and the p's become simply radial coordinates. A1 =−0.038094023 A2 = −2.7327913e−006 A3 =   5.0795942e−010 A4 =−5.0245151e−014 A5 =   1.5103625e−018

[0162] VARIABLE THICKNESS POSITIONS AND DATA P1 P2 P3 P4 P5 P6 P7 EFL7.428 12.285 19.009 32.781 65.564 93.100 144.823 F/No. 1.949 1.949 1.9491.949 1.949 2.010 2.090 S0 Infinity 5322.630 2499.896 Infinity 5322.630Infinity 5322.630 S3 18.151 48.521 79.959 18.151 48.521 18.151 48.521 S56.399 10.135 15.000 6.399 10.135 6.399 10.135 S9 71.409 37.303 1.00071.409 37.303 71.409 37.303 S15 1.350 67.051 110.745 155.094 189.151203.856 210.392 S22 319.660 247.857 197.854 142.790 92.653 65.474 50.046S29 9.625 15.727 22.036 32.751 48.830 61.304 70.197 S48 1.498 1.4981.498 1.498 1.498 2.823 4.711 S54 63.257 63.257 63.257 63.257 63.25761.933 60.044 P8 P9 P10 P11 P12 P13 EFL 206.030 486.383 715.335 2050.0424776.501 1890.393 F/No. 2.360 2.840 5.600 14.500 14.500 5.600 S0Infinity 5322.630 Infinity Infinity 8708.002 5322.630 S3 18.151 48.52118.151 18.151 37.472 48.521 S5 6.399 10.135 6.399 6.399 8.770 10.135 S971.409 37.303 71.409 71.409 49.718 37.303 S15 215.814 218.878 223.339224.980 224.980 223.339 S22 33.074 24.338 10.235 1.719 1.719 10.235 S2981.746 87.419 97.063 103.934 103.934 97.063 S48 9.572 14.559 31.08063.536 63.536 31.080 S54 55.183 50.196 33.675 1.220 1.220 33.675

[0163] The prescription of binary surface 6 is included following thelens system optical prescription table listed above. The addition ofbinary surface 6 to the basic lens system optical prescription of theembodiment of FIGS. 10-62 allows the substitution of less expensiveglass, such as BK7, for the fluor-crown glass of lens elements 3 and 4(third and fourth from the left in FIG. 65). Although other smallchanges are also made in the prescription, the zoom lens system of FIGS.65 and 66 has the same number of lens elements and the same number ofmoving groups for focusing and zoom as the embodiment of FIGS. 10-62.FIG. 65 shows the zoom lens system with the zoom groups positioned atthe longest focal length and the focus groups focused at infinity.Similarly, the ray aberration graphs of FIG. 66 are at infinity focusand the longest focal length.

[0164] FIGS. 67-70 illustrate an example of another embodiment of thepresent invention. This embodiment of the zoom lens system of thepresent invention has a zoom ratio of about 400:1. Specifically, thisembodiment has a zoom range of focal lengths of about 7.47 mm (theposition shown in FIG. 67) to about 2983 mm (the position shown in FIG.68). As with the embodiment of FIGS. 10-62, this embodiment has threemoving zoom lens groups ZG1, ZG2 and ZG3, with two of them in the frontzoom lens portion and one in the rear zoom lens portion. The rayaberration graphs of FIGS. 69 and 70 are at paraxial effective focallengths (EFL) of 7.47 mm and 2983 mm, respectively, and illustrate thatthis embodiment performs well, considering the extremely wide range offocal lengths and large zoom ratio which is similar to the performancecharacteristics of the embodiment of FIGS. 10-62. The optical diagramsof FIGS. 67 and 68 and the ray aberration graphs of FIGS. 69 and 70 areshown at infinity focus.

[0165] The lens system optical prescription of FIGS. 67-70 is set forthbelow in the tables generally entitled “Tables for FIGS. 67 thru 70.”The following data in the lens system optical prescription is set forthin the same manner and the legends have the same meanings as in thepreceding lens system optical prescriptions. TABLES FOR FIGS. 67 thru 70LENS SYSTEM OPTICAL PRESCRIPTION Glass Surface Radius Thickness NameOBJECT Infinity Variable S1 1018.780 15.000 LAH78 S2 277.432 28.775 S3523.118 37.500 S-FPL51 S4 −634.022 1.500 S5 323.390 30.000 S-FPL51 S6#−2096.922 −0.001 S7* 177.503 27.000 S-FPL51 S8 667.737 Variable S9363.133 6.000 TAF1 S10* 84.560 23.084 S11 −1731.870 4.500 TAF1 S12117.736 21.933 S13 −68.241 4.672 TAF1 S14 1396.861 11.280 PBH71 S15−123.171 Variable S16 −351.922 21.562 S-FPL51 S17 −87.960 0.750 S18670.190 25.507 LAK21 S19 −96.809 4.500 FD6 S20 −253.794 18.318 S21112.307 6.052 FCS S22 345.143 Variable STOP Infinity 6.066 S24* −49.6124.500 PSK53A S25 45.951 6.491 FD15 S26 149.306 8.138 S27 −53.675 2.556PSK53A S28 −436.714 15.264 FD8 S29 −53.001 30.067 S30 96.369 40.439S-FPL51 S31 −47.937 4.500 S-LAH75 S32 −65.887 0.018 S33 314.723 4.500S-LAH75 S34 44.980 33.625 S-FPL53 S35 −197.211 62.647 S36* 59.624 15.000S-FPL53 S37 −45862.250 62.567 S38 Infinity 2.000 S39 −250.000 2.000S-LAH66 S40 38.600 21.997 S41 −42.668 3.012 PBH23W S42 78.619 20.849S-LAL8 S43 −54.572 0.250 S44 701.714 11.340 S-LAL8 S45 −96.232 0.250 S46153.694 14.173 S-LAL8 S47 −120.652 0.250 S48 57.764 24.753 S-LAM2 S49−654.450 3.706 PBH6W S50 36.175 17.533 S51 126.517 2.500 PBH53W S52123.911 5.000 S-BSM14 S53 −269.378 0.200 S54 119.317 5.000 S-BSM18 S55249.395 Variable S56 77.473 2.500 S-LAH60 S57 24.795 8.736 S58 −17.8802.000 S-LAH55 S59 −73.667 1.561 S60 −68.965 7.000 PBH53W S61 −23.6200.200 S62 −39.257 2.000 S-LAH65 S63 −73.267 Variable S64* 40.900 24.089S-BAL42 S65* −82.736 0.200 S66 68.814 3.000 PBH53W S67 33.834 VariableS68 47.963 12.055 S-BSL7 S69 −38.097 8.000 PBH6W S70 −61.203 VariableS71 Infinity 11.874 S-BSL7 S72 Infinity 14.000 IMAGE Infinity

[0166]$Z = {\frac{({CURV})Y^{2}}{1 + \left( {1 - {\left( {1 + K} \right)({CURV})^{2}Y^{2}}} \right)^{1/2}} + {(A)Y^{4}} + {(B)Y^{6}} + {(C)Y^{8}} + {(D)Y^{10}} + {(E)Y^{12}}}$

[0167] where:

[0168] CURV=1/(Radius of Surface)

[0169] Y=Aperture height, measured perpendicular to optical axis

[0170] K, A, B, C, D=Coefficients

[0171] Z=Position of surface profile for a given Y value, as measuredalong the optical axis from the pole (i.e. axial vertex) of the surface.The coefficients for the surface S7 are: K = −0.01834396 A =  4.6192051e−009 B =   2.9277175e−013 C = −5.3760139e−018 D =  4.4429222e−022 E =   0 The coefficients for the surface S24 are: K =−0.1283323 A = −2.7157663e−007 B =   1.4568941e−010 C = −1.4055959e−012D =   9.7130719e−016 E =   0 The coefficients for the surface S64 are: K= −4.594951 A =   5.9382510e−006 B = −4.3333569e−009 C = −2.6412286e−013D =   5.0607811e−015 E = −3.8443669e−018 The coefficients for thesurface S10 are: K =   0.1385814 A = −6.1078514e−008 B = −1.7110958e−012C = −1.4298682e−015 D = −7.3308393e−019 E =   0 The coefficients for thesurface S36 are: K =   0.009973727 A =   3.3999271e−008 B =  1.4717268e−010 C = −1.0665963e−013 D =   6.8463872e−017 E =   0 Thecoefficients for the surface S65 are: K = −0.2743554 A =  1.2036084e−006 B =   3.8383867e−009 C = −1.5101902e−011 D =  2.3291313e−014 E = −1.3549754e−017

Added Phase=A ₁ p ² +A ₂ p ⁴ +A ₃ p ⁶ +A ₄ p ⁸ +A ₅ p+HU10

[0172] where: A₁, A₂, A₃, A₄ and A₅ are coefficients and p is thenormalized radial coordinate at the surface. The normalizing factor isset at unity and the p's become simply radial coordinates. A1 =−0.0183497 A2 = 0.1385814 A3 = −0.1283323 A4 = 0.0099737 A5 = −4.5949510A6 = −0.2743554

[0173] VARIABLE THICKNESS POSITIONS AND DATA P1 P2 P3 P4 P5 P6 P7 EFL7.471 11.746 18.475 29.059 45.676 649.701 2981.989 F/No. 1.600 1.6001.600 1.600 1.600 6.000 18.000 S0 Infinity Infinity Infinity InfinityInfinity Infinity Infinity S8 3.884 47.335 81.309 107.642 127.477147.901 156.198 S15 243.496 190.547 145.303 105.453 68.586 39.080 0.104S22 5.292 14.777 26.064 39.600 56.513 65.772 96.339 S55 1.000 1.0001.000 1.000 1.000 98.702 111.239 S63 117.540 117.540 117.540 117.540117.540 30.129 0.368 S67 42.175 42.175 42.175 42.175 42.175 20.67063.421 S70 14.512 14.512 14.512 14.512 14.512 25.727 0.199

[0174] Detailed Description of Folded Lens Embodiment. FIG. 71 is anoptical diagram illustrating an example of still another embodiment ofthe present invention incorporating one or more mirrors for folding thelens for added compactness. The example of FIG. 71 is similar to thepreviously-described embodiments, with three general zoom groupsidentified as 50, 52 and 54. An intermediate image is located at 56. Thefocus group 66 is movable during focusing, but is stationary when thelens is at a constant focus. The aperture stop is located at 84. Uniqueto the folded zoom lens embodiment of FIG. 71 is a mirror 64 locatedbetween the front and rear zoom groups 52 and 54 for “folding” orbending the radiation rays. The embodiment of FIG. 71 may be employed inany camera, but is particularly suited for small cameras such aspoint-and-shoot handheld cameras because the folded design enables thelens to fit into a smaller space. FIG. 71 illustrates an SLR embodimentcontaining a reflex mirror 60 and an eyelens 62 for enabling a user tosee the image while the reflex mirror 60 is in the position indicated inFIG. 71.

[0175] Embodiments of the present invention are particularly suited tofolding because mirror 64 may be placed within the intermediate imagespace 58 in any area that does not interfere with the movement of thezoom groups 52 and 54. In contrast, conventional compact zoom lenseshave lens elements that must retract into the body of the camera, whicheliminates most or all or the air gaps within the lens and precludes theinsertion of a mirror. In the example of FIG. 71, the mirror 64 islocated on the image side of the intermediate image 56. However, inother embodiments, the mirror 64 may be located on the object side ofthe intermediate image 56. It should be understood that otherembodiments of the present invention may have multiple folds (mirrors),and that the mirrors need not be oriented at 45 degrees with respect tothe optical axis.

[0176] The folded lens illustrated in the example of FIG. 71 enablesseveral useful design possibilities and advantages. As mentioned above,the fold in the lens enables the zoom lens to take up less space.Furthermore, the folded zoom lens enables some or all of the lenselements to reside within the body of the camera, further improvingcompactness. In one embodiment, even the focus lens group 66 may resideentirely within the body of the camera, protecting the lens and makingthe camera even more compact. In addition, the folded zoom lens enablescompact cameras to achieve a zoom ratio of about 10:1 or higher,compared to a maximum of about 4:1 in conventional compact cameras.Moreover, conventional SLR cameras require a bulky pentaprism forflipping the image, and thus compact cameras typically avoidthrough-the-lens viewing. However, because of the intermediate image 56and mirrors 64 and 60 in the present invention, the final image isalready properly oriented without the need for a bulky pentaprism, andthrough-the-lens viewing is made possible even in cameras of a compactsize.

[0177] The exemplary folded zoom lens of FIG. 71 provides an EFL ofabout 12 mm to 120 mm, a zoom ratio of about 10:1, an “f” number rangeof about f/3 to f/5 at full aperture and a maximum field of view anglein object space of about 84.1 degrees to 10.3 degrees, and receivesradiation within a waveband of at least 486 nm to 588 nm. The imagegenerated by the embodiment of FIG. 71 is about 12 mm in height by about18 mm in width with a diagonal dimension of about 21.65 mm, which isabout half the size of the image in a conventional 35 mm stillphotography camera.

[0178] FIGS. 72A-72D are optical diagrams illustrating the folded zoomlens example embodiment of FIG. 71 at other zoom positions, with thefolded lens shown in a flat (unfolded) orientation for clarity and thezoom groups in various exemplary positions. As in FIG. 71, the focuslens group 66 in the example of FIGS. 72A-72D is movable for focusingand stationary at a constant focus, and the mirror 64 and eyelens 62 arealso stationary. The aperture stop is located at 84 and is movableduring zooming. The zoom lens example of FIGS. 72A-72D is actuallycomprised of eight moving zoom groups 68, 70, 72, 74, 76, 78, 80 and 82,although it should be understood that other embodiments of the foldedzoom lens may include more or fewer zoom groups. The folded zoom lensexample of FIGS. 72A-72D utilizes all spherical surfaces, but it shouldbe understood that other embodiments may employ aspheres and/or binary(diffractive) surfaces.

[0179] Detailed Description of Infrared Embodiment. FIGS. 73A-73C areoptical diagrams for an example of an infrared (IR) embodiment of thezoom lens system of the present invention, illustrating variouspositions of the zoom groups. The intermediate image is located at 86.The focus group 88 is movable during focusing, but is stationary at aconstant focus. The final image plane is located at 90, and the aperturestop is located at 92. The embodiment of FIGS. 73A-73C may be employedin low light and surveillance cameras because the zoom lens system isdesigned for infrared wavelengths. The example of FIGS. 73A-73C providesan EFL of 6.68 mm to 1201.2 mm, an “f” number range of f/2.00 to f/5.84,an image diagonal of 8.0 mm, a maximum field of view angle in objectspace of 64.5 degrees to 0.388 degrees, and a vertex length of 902.28mm. There is a −4.93% distortion at the 6.68 mm focal length positionand +0.34% distortion at the 1201.2 mm focal length position. Thisdistortion increases the effective zoom ratio to 190:1. There are atotal of nine elements in the example of FIGS. 73A-73C, with sixelements (94, 96, 98, 100, 102 and 104) in the zoom kernel 106, andthree elements (108, 110 and 112) in the zoom relay 114. Note that the“zoom kernel,” as referred to herein, represents all of the elementsfrom object space to the intermediate image, while the “zoom relay,” asreferred to herein, represents all of the elements from the intermediateimage to the final image.

[0180] The lens system optical prescription for the IR embodiment ofFIGS. 73A-73C is set forth below in the tables generally entitled“Tables for FIGS. 73A, 73B and 73C.” The following data in the lenssystem optical prescription is set forth in the same manner and thelegends have the same meanings as in the preceding lens system opticalprescriptions. TABLES FOR FIGS. 73A, 73B AND 73C LENS SYSTEM OPTICALPRESCRIPTION Refractive Surface Radius Thickness Material OBJECTInfinity Infinity S1 Infinity 25.000 S2* 341.091 15.000 GERMANIUM S3#442.256 14.496 S4 628.089 15.000 ZNSE S5 817.176 Variable S6* 191.3215.000 GERMANIUM S7 101.374 Variable S8 −108.986 5.000 GERMANIUM S9−133.542 Variable S10* 132.195 10.000 GERMANIUM S11 215.451 106.451 S12*44.406 7.000 GERMANIUM S13* 47.364 Variable S14* −146.583 5.000GERMANIUM S15* −103.306 Variable S16* −48.015 6.000 ZNSE S17* −54.690Variable S18* −134.510 5.000 GERMANIUM S19* −96.541 Variable STOPInfinity 74.251 IMAGE Infinity

[0181] $\begin{matrix}{Z = {\frac{({CURV})Y^{2}}{1 + \left( {1 - {\left( {1 + K} \right)({CURV})^{2}Y^{2}}} \right)^{1/2}} +}} \\{{{(A)Y^{4}} + {(B)Y^{6}} + {(C)Y^{8}} + {(D)Y^{10}} + {(E)Y^{12}} + {(F)Y^{14}} + {(G)Y^{16}}}}\end{matrix}$

[0182] where:

[0183] CURV=1/(Radius of Surface)

[0184] Y=Aperture height, measured perpendicular to optical axis

[0185] K, A, B, C, D=Coefficients

[0186] Z=Position of surface profile for a given Y value, as measuredalong the optical axis from the pole (i.e. axial vertex) of the surface.The coefficients for the surface S2 are: K = −0.3170663 A =  7.1675212e−010 B =   4.6490286e−015 C =   3.1509558e−020 D =−3.0230207e−026 E =   1.8711604e−043 F =   7.2023035e−034 G =−1.6899714e−038 The coefficients for the surface S6 are: K =   0.0000000A =   8.8834511e−009 B = −1.1017434e−012 C =   4.2407818e−016 D =−4.5843672e−020 E =   0 F =   0 G =   0 The coefficients for the surfaceS10 are: K =   0.0000000 A = −4.1468720e−008 B = −1.1864804e−012 C =  1.0375271e−016 D =   1.4819552e−020 E =   0 F =   0 G =   0 Thecoefficients for the surface S12 are: K =   0.1424633 A =−1.3741884e−008 B =   2.0574529e−010 C =   2.2356569e−013 D =−9.2592205e−016 E =   0 F =   0 G =   0 The coefficients for the surfaceS13 are: K =   0.1341907 A =   2.5853953e−007 B =   6.3040925e−010 C =−8.9182471e−013 D = −2.1087914e−016 E =   0 F =   0 G =   0 Thecoefficients for the surface S14 are: K =   0.0000000 A =−2.3627230e−006 B = −3.2069853e−009 C =   1.9995538e−012 D =−4.1873811e−015 E = −4.5598387e−018 F =   1.5355757e−021 G =  2.7742963e−025 The coefficients for the surface S15 are: K =  0.0000000 A = −1.9992749e−006 B = −2.7451965e−009 C =   2.5915567e−012D = −5.4747396e−015 E =   1.0432409e−018 F = −9.7041838e−023 G =  3.5844261e−025 The coefficients for the surface S16 are: K =  0.0000000 A = −5.5264489e−007 B = −3.4855834e−011 C = −1.5605019e−013D =   8.4346229e−016 E = −2.6930213e−019 F =   7.0886850e−022 G =−4.8763355e−025 The coefficients for the surface S17 are: K =  0.0000000 A = −1.9256081e−007 B =   9.7560057e−012 C = −3.1406997e−013D =   4.6996712e−016 E =   4.3471337e−019 F = −3.7957715e−022 G =−2.4875152e−026 The coefficients for the surface S18 are: K =  0.0000000 A =   4.5197079e−007 B = −4.7688707e−010 C = −2.2771179e−013D = −7.3812375e−016 E =   6.1621050e−019 F = −2.9782920e−023 G =−2.8295343e−026 The coefficients for the surface S19 are: K =  0.0000000 A =   3.9066750e−007 B = −2.6768710e−010 C = −3.7378469e−013D = −4.0450877e−016 E =   3.9230103e−019 F = −3.7514135e−023 G =−8.0738327e−027

Added Phase=A ₁ p ² +A ₂ p ⁴ +A ₃ p ⁶ +A ₄ p ⁸ +A ₅ p+HU10

[0187] where: A₁, A₂, A₃, A₄ and A₅ are coefficients and p is thenormalized radial coordinate at the surface. The normalizing factor isset at unity and the p's become simply radial coordinates.

[0188] A1=−0.0085882326

[0189] A2=−1.2587653e-008

[0190] A3==5.4668365e-013

[0191] A4=8.4183658e-018

[0192] A5=1.3774055e-022 VARIABLE THICKNESS POSITIONS AND DATA P1 P2 P3P4 P5 P6 EFL 6.677 7.583 9.331 11.805 14.069 23.805 F/No. 2.000 2.0002.000 2.000 2.000 2.000 S5 5.000 25.000 55.000 85.000 105.000 155.000 S7239.848 216.543 180.384 143.845 119.259 58.715 S9 72.916 76.220 82.37988.919 93.504 104.048 S13 276.674 276.674 276.674 276.674 276.674276.674 S15 5.030 5.030 5.030 5.030 5.030 5.030 S17 29.517 29.517 29.51729.517 29.517 29.517 S19 5.000 5.000 5.000 5.000 5.000 5.000 P7 P8 P9P10 P11 P12 EFL 48.419 84.275 133.455 175.637 231.172 304.215 F/No.2.000 2.000 2.000 2.300 2.900 3.400 S5 205.000 231.305 243.545 243.545243.545 243.545 S7 16.543 30.757 72.218 72.218 72.218 72.218 S9 96.22155.701 2.000 2.000 2.000 2.000 S13 276.674 276.674 276.674 248.444220.313 187.659 S15 5.030 5.030 5.030 42.180 79.972 109.931 S17 29.51729.517 29.517 22.953 12.626 5.000 S19 5.000 5.000 5.000 2.644 3.31013.631 P13 P14 P15 P16 P17 EFL 400.368 526.915 693.449 912.675 1201.182F/No. 3.500 3.800 4.600 5.300 5.840 S5 243.545 243.545 243.545 243.545243.545 S7 72.218 72.218 72.218 72.218 72.218 S9 2.000 2.000 2.000 2.0002.000 S13 146.432 112.380 97.552 94.304 95.940 S15 114.831 95.642 67.31140.305 16.014 S17 10.137 19.763 26.212 25.615 18.454 S19 44.821 88.436125.146 155.997 185.814

[0193] FIGS. 74-76 are ray aberration graphs corresponding to theposition of the zoom groups shown in FIGS. 73A-73C, respectively. Theray aberration graphs of FIGS. 74-76 are at paraxial effective focallengths (EFL) of 6.68 mm, 133.46 mm, and 1201.18 mm, respectively, and awavelength range of 8-12 microns. The optical diagrams of FIGS. 73A-73Cand the ray aberration graphs of FIGS. 74-76 are shown at infinityfocus.

[0194] Although the present invention has been fully described inconnection with embodiments thereof with reference to the accompanyingdrawings, it is to be noted that various changes and modifications willbecome apparent to those skilled in the art. Such changes andmodifications are to be understood as being included within the scope ofthe present invention as defined by the appended claims.

What is claimed is:
 1. A zoom lens system for forming a final image ofan object, said system having an object side and an image side andforming a first intermediate real image between the object and the finalimage, said system comprising in order from the object side to the imageside: a first optical unit including at least two lens elements andlocated between the object and the first intermediate real image, saidunit comprising at least one optical subunit which is moved to changethe size (magnification) of the first intermediate real image; and asecond optical unit including at least two lens elements and locatedbetween the first intermediate real image and the final image, at leasta portion of which is moved to change the size (magnification) of thefinal image.
 2. The zoom lens system as recited in claim 1, the secondoptical unit comprising at least one optical subunit, and at least oneof the optical subunits is movable to hold an axial position of thefinal image substantially stationary as the focal length of the systemis changed.
 3. The zoom lens system as recited in claim 1, wherein thesecond optical unit comprises at least one optical subunit and at leastone of the optical subunits in each of the first and second opticalunits moves gcontinously as the foca length of the system is changed. 4.The zoom lens system as recited in claim 1, wherein the second opticalunit comprises at least one optical subunit and at least one of theoptical subunits in one of the first and second optical units is atleast temporarily stationary while at least one of the optical subunitsin the other of the first and second optical units moves as the focallength of the system is changed.
 5. The zoom lens system as recited inclaim 1, wherein: (a) the second optical unit comprises at least oneoptical subunit; and (b) a change in the focal length of the systemincludes at least one first motion and at least one second motionwherein: (i) the first motion can precede or follow the second motion;(ii) for the first motion, at least one optical subunit of the firstoptical unit moves without movement of any optical subunit of the secondoptical unit; and (iii) for the second motion, at least one opticalsubunit of the second optical unit moves without movement of any opticalsubunit of the first optical unit.
 6. The zoom lens system as recited inclaim 5, wherein a change in the focal length of the system includesonly a single first motion and a single second motion.
 7. The zoom lenssystem as recited in claim 1, further comprising a focus unit on theobject side of the first optical unit for focusing at least one of theintermediate and final images.
 8. The zoom lens system as recited inclaim 1 wherein the first optical unit comprises an aperture stop andthe system further comprises a pupil imaging unit located between thefirst and second optical units for imaging an exit pupil of the firstoptical unit to form an entrance pupil of the second optical unit. 9.The zoom lens system as recited in claim 1 wherein the second opticalunit comprises an aperture stop and the system further comprises a pupilimaging unit located between the first and second optical units forimaging an entrance pupil of the second optical unit to form an exitpupil of the first optical unit.
 10. The zoom lens system as recited inclaim 1, further comprising an image stabilization unit on the imageside of the second optical unit for stabilizing the final image.
 11. Thezoom lens system as recited in claim 7, the focus unit comprising twooptical subunits that are movable along the optical axis of the zoomlens system.
 12. The zoom lens system as recited in claim 11, whereinthe optical axis is straight.
 13. The zoom lens system as recited inclaim 7, the focus unit comprising seven or fewer lens elements.
 14. Thezoom lens system as recited in claim 10, the image stabilization unitcomprising at least one lens element that is laterally movable off theoptical axis of the zoom lens system.
 15. The zoom lens system asrecited in claim 10, the image stabilization unit comprising at leastone lens element that is axially movable along the optical axis of thezoom lens system.
 16. The zoom lens system as recited in claim 10, theimage stabilization unit comprising at least one laterally movable lenselement that is laterally movable off the optical axis of the zoom lenssystem and at least one axially movable lens element that is axiallymovable along the optical axis, the at least one laterally movable lenselement separated from the at least one axially movable lens element byan air gap, wherein radiation from the object and passing through theair gap is substantially collimated.
 17. The zoom lens system as recitedin claim 14, wherein radiation from the object and passing through thesystem is substantially collimated at the at least one laterally movablelens element.
 18. The zoom lens system as recited in claim 15, whereinradiation from the object and passing through the system issubstantially collimated at the at least one axially movable lenselement.
 19. The zoom lens system as recited in claim 1, wherein one ormore additional intermediate real images are formed between the objectand the final image.
 20. The zoom lens system as recited in claim 19,further comprising one or more additional optical units for changing thesize (magnification) of the one or more additional intermediate realimages.
 21. The zoom lens system as recited in claim 1, wherein thefirst intermediate real image is formed in an air space between opticalelements in the zoom lens system and remains in the air space duringzooming.
 22. The zoom lens system as recited in claim 19, wherein theone or more additional intermediate real images are formed in one ormore air spaces between optical elements in the zoom lens system andremain in the one or more air spaces during zooming.
 23. The zoom lenssystem of claim 1 wherein the system comprises at least one asphericoptical surface.
 24. The zoom lens system of claim 1 wherein the systemcomprises at least one diffractive optical surface.
 25. The zoom lenssystem of claim 1 wherein the system comprises at least one asphericoptical surface and at least one diffractive optical surface.
 26. A zoomlens system for forming a final image of an object, said system forminga first intermediate real image between the object and the final image,said system comprising compounded first and second zoom lenses whereinthe compounded first and second zoom lenses have controlled pupilimaging with respect to one another.
 27. The zoom lens system as recitedin claim 26, wherein at least a portion of each of the first and secondzoom lenses moves continuously as the focal length of the system ischanged.
 28. The zoom lens system as recited in claim 26, wherein atleast a portion of one of the first and second zoom lenses is at leasttemporarily stationary while at least a portion of the other of thefirst and second zoom lenses moves as the focal length of the system ischanged.
 29. The zoom lens system as recited in claim 26, wherein achange in the focal length of the system includes at least one firstmotion and at least one second motion wherein: (a) the first motion canprecede or follow the second motion; (b) for the first motion, only thefirst zoom lens changes the focal length of the system; and (c) for thesecond motion, only the second zoom lens changes the focal length of thesystem.
 30. The zoom lens system as recited in claim 29, wherein achange in the focal length of the system includes only a single firstmotion and a single second motion.
 31. A zoom lens system for forming afinal image of an object, said system having an object side and an imageside and comprising in order from the object side to the image side: azoom lens that forms an intermediate real image; and a variable focallength relay system that receives the intermediate real image andchanges its magnification to form the final image.
 32. The zoom lenssystem as recited in claim 31, wherein at least a portion of each of thezoom lens and the relay system moves continuously as the focal length ofthe system is changed.
 33. The zoom lens system as recited in claim 31,wherein at least a portion of one of the zoom lens and the relay systemis at least temporarily stationary while at least a portion of the otherof the zoom lens and the relay system moves as the focal length of thesystem is changed.
 34. The zoom lens system as recited in claim 31,wherein a change in the focal length of the system includes at least onefirst motion and at least one second motion wherein: (a) the firstmotion can precede or follow the second motion; (b) for the firstmotion, only the zoom lens changes the focal length of the system; and(c) for the second motion, only the relay system changes the focallength of the system.
 35. The zoom lens system as recited in claim 34,wherein a change in the focal length of the system includes only asingle first motion and a single second motion.
 36. A zoom lens systemfor forming a final image of an object, the zoom lens system having arange of focal lengths between a maximum focal length and a minimumfocal length and forming at least a first intermediate real imagebetween the object and the final image for all focal lengths within therange of focal lengths, the zoom lens system having an object side andan image side and comprising in order from the object side to the imageside: a first lens unit having a focal length that is changed to changethe size (magnification) of the first intermediate real image, the firstlens unit being located between the object and the first intermediatereal image; and a second lens unit for changing the size (magnification)of the final image, the second lens unit being located between the firstintermediate real image and the final image.
 37. The zoom lens system asrecited in claim 36, wherein at least a portion of each of the first andsecond lens units moves continuously as the focal length of the systemis changed.
 38. The zoom lens system as recited in claim 36, wherein atleast a portion of one of the first and second lens units is at leasttemporarily stationary while at least a portion of the other of thefirst and second lens units moves as the focal length of the system ischanged.
 39. The zoom lens system as recited in claim 36, wherein achange in the focal length of the system includes at least one firstmotion and at least one second motion wherein: (a) the first motion canprecede or follow the second motion; (b) for the first motion, only thefirst lens unit changes the focal length of the system; and (c) for thesecond motion, only the second lens unit changes the focal length of thesystem.
 40. The zoom lens system as recited in claim 39, wherein achange in the focal length of the system includes only a single firstmotion and a single second motion.
 41. A zoom lens system having anobject side and an image side and comprising in order from the objectside to the image side: a variable focal length lens unit that forms anintermediate real image of an object; and a variable focal length lensunit that forms a real image of the intermediate real image.
 42. Thezoom lens system as recited in claim 41, wherein at least a portion ofeach of the variable focal length lens units moves continuously as thefocal length of the system is changed.
 43. The zoom lens system asrecited in claim 41, wherein at least a portion of one of one of thevariable focal length lens units is at least temporarily stationarywhile at least a portion of the other of the variable focal length lensunits moves as the focal length of the system is changed.
 44. The zoomlens system as recited in claim 41, wherein a change in the focal lengthof the system includes at least one first motion and at least one secondmotion wherein: (a) the first motion can precede or follow the secondmotion; (b) for the first motion, only the variable focal length lensunit that forms the intermediate real image changes the focal length ofthe system; and (c) for the second motion, only the variable focallength lens unit that forms a real image of the intermediate real imagechanges the focal length of the system.
 45. The zoom lens system asrecited in claim 44, wherein a change in the focal length of the systemincludes only a single first motion and a single second motion.
 46. Acompound zoom lens system for collecting radiation from an object anddelivering the radiation to a sensor, said system comprising multiplezoom lens portions including a first zoom lens portion nearest to theobject for forming an intermediate image of the object and a last zoomlens portion nearest to the sensor for delivering radiation from theintermediate image to the sensor.
 47. The compound zoom lens system asrecited in claim 46, wherein at least a portion of each of the first andlast zoom lens portions moves continuously as the focal length of thesystem is changed.
 48. The compound zoom lens system as recited in claim46, wherein at least a portion of one of the first and last zoom lensportions is at least temporarily stationary while at least a portion ofthe other of the first and last zoom lens portions moves as the focallength of the system is changed.
 49. The compound zoom lens system asrecited in claim 46, wherein a change in the focal length of the systemincludes at least one first motion and at least one second motionwherein: (a) the first motion can precede or follow the second motion;(b) for the first motion, only the first zoom lens portion changes thefocal length of the system; and (c) for the second motion, only the lastzoom lens portion changes the focal length of the system.
 50. Thecompound zoom lens system as recited in claim 49, wherein a change inthe focal length of the system includes only a single first motion and asingle second motion.
 51. The compound zoom lens system as recited inclaim 46 wherein the multiple zoom lens portions include only the firstzoom lens portion and the last zoom lens portion.
 52. A zoom lens systemfor forming a final image of an object, said system having a variablefocal length, an optical axis, an aperture stop, and a chief ray thatcrosses the optical axis at the aperture stop, said system comprising:two lens units for changing the focal length of the system and forforming the final image, one of the units having a variable focal lengthand the other unit having at least a portion that is moveable; whereinthe chief ray crosses the optical axis at at least one other locationbesides said aperture stop for all focal lengths of the system; andwherein the system forms an intermediate real image that is locatedbetween the two lens units for all focal lengths of the system.
 53. Thezoom lens system as recited in claim 52, wherein the optical axis isstraight.
 54. The zoom lens system as recited in claim 52, wherein thesystem has a lens surface closest to the object and the at least oneother location at which the chief ray crosses the optical axis isbetween said lens surface and the final image for all focal lengths ofthe system.
 55. The zoom lens system as recited in claim 52, wherein atleast a portion of each of the two lens units moves continuously as thefocal length of the system is changed.
 56. The zoom lens system asrecited in claim 52, wherein at least a portion of one of the two lensunits is at least temporarily stationary while at least a portion of theother of the two lens units moves as the focal length of the system ischanged.
 57. The zoom lens system as recited in claim 52, wherein achange in the focal length of the system includes at least one firstmotion and at least one second motion wherein: (a) the first motion canprecede or follow the second motion; (b) for the first motion, only thelens unit having a variable focal length changes the focal length of thesystem; and (c) for the second motion, only the lens unit having atleast a portion that is moveable changes the focal length of the system.58. The zoom lens system as recited in claim 57, wherein the change inthe focal length of the system includes only a single first motion and asingle second motion.
 59. A zoom lens system comprising: a zoom kernelfor forming an intermediate real image; and a zoom relay for magnifyingthe intermediate real image to form a final image.
 60. The zoom lenssystem as recited in claim 59, wherein at least a portion of each of thezoom kernel and the zoom relay moves continuously as the focal length ofthe system is changed.
 61. The zoom lens system as recited in claim 59,wherein at least a portion of one of the zoom kernel and the zoom relayis at least temporarily stationary while at least a portion of the otherof the zoom kernel and the zoom relay moves as the focal length of thesystem is changed.
 62. The zoom lens system as recited in claim 59,wherein a change in the focal length of the system includes at least onefirst motion and at least one second motion wherein: (a) the firstmotion can precede or follow the second motion; (b) for the firstmotion, only the zoom kernel changes the focal length of the system; and(c) for the second motion, only the zoom relay changes the focal lengthof the system.
 63. The zoom lens system as recited in claim 62, whereina change in the focal length of the system includes only a single firstmotion and a single second motion.
 64. The zoom lens system as recitedin claim 59, the zoom kernel comprising a zoom lens having a +−++construction.
 65. The zoom lens system as recited in claim 59, the zoomkernel comprising a zoom lens having a +−−+ construction.
 66. The zoomlens system as recited in claim 59, the zoom kernel comprising a zoomlens having a −+ construction.
 67. The zoom lens system as recited inclaim 59, the zoom kernel comprising a zoom lens having a −++construction.
 68. The zoom lens system as recited in claim 59, the zoomkernel comprising a zoom lens having a −+−+ construction.
 69. The zoomlens system as recited in claim 59, the zoom relay comprising a zoomlens having a +−++ construction.
 70. The zoom lens system as recited inclaim 59, the zoom relay comprising a zoom lens having a +−+construction.
 71. The zoom lens system as recited in claim 59, the zoomrelay comprising a zoom lens having a −+ construction.
 72. The zoom lenssystem as recited in claim 59, the zoom kernel comprising a first lensunit for focusing at least one of the intermediate and final images. 73.The zoom lens system as recited in claim 72, wherein internal motionswithin the first lens unit are used to contribute to the correction offocus breathing.
 74. The zoom lens system as recited in claim 59,wherein the system comprises one or more lens elements each with atleast one aspheric surface for contributing to the correction of atleast one of distortion and spherical aberration.
 75. The zoom lenssystem as recited in claim 59, wherein the system comprises one or morefluor crown glass or calcium fluoride lens elements for contributing tothe correction of color aberrations.
 76. The zoom lens system as recitedin claim 59, wherein the system comprises one or more lens elementshaving a diffractive surface for contributing to the correction of coloraberrations.
 77. A zoom lens system having a first lens unit that formsa real intermediate image and a second lens unit that forms a secondimage of the real intermediate image, said zoom lens system having azoom ratio of at least 120 to
 1. 78. The zoom lens system as recited inclaim 77 wherein the zoom ratio is at least 200 to 1.